diff --git a/apps/server/docs/ai-context/metrics-ownership.md b/apps/server/docs/ai-context/metrics-ownership.md
index bd96903bf..d79692bf1 100644
--- a/apps/server/docs/ai-context/metrics-ownership.md
+++ b/apps/server/docs/ai-context/metrics-ownership.md
@@ -112,7 +112,7 @@
 ### PostHog（前端 / 外部数据源，产品侧）
 
 已接入：
-- 前端 `posthog-js` 通过 `packages/stage-ui/src/stores/analytics/posthog.ts` 初始化；web / desktop / pocket / auth / docs 共用一个 project key，以 `app_surface` 区分运行端。
+- 前端 `posthog-js` 通过 `packages/stage-ui/src/stores/analytics/posthog.ts` 动态 adapter 初始化；web / desktop / pocket / auth / docs 共用一个 project key，以 `app_surface` 区分运行端。
 - Server 先把产品事实写入 `product_events`，再异步 best-effort 转发注册、支付、订阅等白名单业务事实到 PostHog；LLM / TTS per-request 事件不转发，PostHog 失败也不能影响请求主链路。
 - 前端 identity：`useSharedAnalyticsStore.initialize()` watch `authStore.isAuthenticated` 自动调 `posthog.identify(user.id)` / `reset()`
 - 平台统一写入 `app_surface`；`entry_surface` 只表示 `settings_flux` 这类业务入口，避免同名字段混用或覆盖 PostHog super property。
diff --git a/apps/stage-pocket/src/App.vue b/apps/stage-pocket/src/App.vue
index afecb30c4..183d10a58 100644
--- a/apps/stage-pocket/src/App.vue
+++ b/apps/stage-pocket/src/App.vue
@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { OnboardingDialog, OnboardingStepAnalyticsNotice, ToasterRoot } from '@proj-airi/stage-ui/components'
 import { useAuthProviderSync } from '@proj-airi/stage-ui/composables/use-auth-provider-sync'
-import { isPosthogAvailableInBuild, useSharedAnalyticsStore } from '@proj-airi/stage-ui/stores/analytics'
+import { isAnalyticsAvailableInBuild, useSharedAnalyticsStore } from '@proj-airi/stage-ui/stores/analytics'
 import { useCharacterOrchestratorStore } from '@proj-airi/stage-ui/stores/character'
 import { useDisplayModelsStore } from '@proj-airi/stage-ui/stores/display-models'
 import { useModsServerChannelStore } from '@proj-airi/stage-ui/stores/mods/api/channel-server'
@@ -108,7 +108,7 @@ function handleSetupSkipped() {
 
 const extraSteps = computed(() => [
   ...(
-    isPosthogAvailableInBuild()
+    isAnalyticsAvailableInBuild()
       ? [{ id: 'analytics-notice', component: OnboardingStepAnalyticsNotice }]
       : []
   ),
diff --git a/apps/stage-pocket/src/main.ts b/apps/stage-pocket/src/main.ts
index 584baa7b2..4f0e1bcdc 100644
--- a/apps/stage-pocket/src/main.ts
+++ b/apps/stage-pocket/src/main.ts
@@ -7,6 +7,7 @@ import NProgress from 'nprogress'
 import { autoAnimatePlugin } from '@formkit/auto-animate/vue'
 import { isEnvTruthy } from '@proj-airi/stage-shared'
 import { trackButtonPlugin } from '@proj-airi/stage-ui/directives/track-button'
+import { configureAnalyticsAdapter } from '@proj-airi/stage-ui/stores/analytics/client'
 import { MotionPlugin } from '@vueuse/motion'
 import { createPinia } from 'pinia'
 import { setupLayouts } from 'virtual:generated-layouts'
@@ -27,6 +28,11 @@ import 'vue-sonner/style.css'
 import './styles/main.css'
 import 'uno.css'
 
+configureAnalyticsAdapter(async (options) => {
+  const { createPosthogAdapter } = await import('@proj-airi/stage-ui/stores/analytics/posthog')
+  return createPosthogAdapter(options)
+})
+
 const pinia = createPinia()
 
 // TODO: vite-plugin-vue-layouts is long deprecated, replace with another layout solution
diff --git a/apps/stage-tamagotchi/src/renderer/main.ts b/apps/stage-tamagotchi/src/renderer/main.ts
index 2d5232e5d..a3fc6454f 100644
--- a/apps/stage-tamagotchi/src/renderer/main.ts
+++ b/apps/stage-tamagotchi/src/renderer/main.ts
@@ -6,6 +6,7 @@ import Tres from '@tresjs/core'
 import { autoAnimatePlugin } from '@formkit/auto-animate/vue'
 import { PiniaColada } from '@pinia/colada'
 import { trackButtonPlugin } from '@proj-airi/stage-ui/directives/track-button'
+import { configureAnalyticsAdapter } from '@proj-airi/stage-ui/stores/analytics/client'
 import { MotionPlugin } from '@vueuse/motion'
 import { createPinia } from 'pinia'
 import { setupLayouts } from 'virtual:generated-layouts'
@@ -37,6 +38,11 @@ import '@fontsource/kiwi-maru/index.css'
 import '@fontsource/m-plus-rounded-1c/index.css'
 import '@fontsource-variable/nunito/index.css'
 
+configureAnalyticsAdapter(async (options) => {
+  const { createPosthogAdapter } = await import('@proj-airi/stage-ui/stores/analytics/posthog')
+  return createPosthogAdapter(options)
+})
+
 const pinia = createPinia()
 
 const router = createRouter({
diff --git a/apps/stage-tamagotchi/src/renderer/pages/onboarding.vue b/apps/stage-tamagotchi/src/renderer/pages/onboarding.vue
index d28a0255d..90af81cea 100644
--- a/apps/stage-tamagotchi/src/renderer/pages/onboarding.vue
+++ b/apps/stage-tamagotchi/src/renderer/pages/onboarding.vue
@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { useElectronEventaInvoke } from '@proj-airi/electron-vueuse'
 import { OnboardingScreen, OnboardingStepAnalyticsNotice } from '@proj-airi/stage-ui/components'
-import { isPosthogAvailableInBuild } from '@proj-airi/stage-ui/stores/analytics'
+import { isAnalyticsAvailableInBuild } from '@proj-airi/stage-ui/stores/analytics'
 import { useAuthStore } from '@proj-airi/stage-ui/stores/auth'
 import { useOnboardingStore } from '@proj-airi/stage-ui/stores/onboarding'
 import { useTheme } from '@proj-airi/ui'
@@ -30,7 +30,7 @@ watch(needsLogin, async (val) => {
 
 const bgClass = computed(() => isDark.value ? 'bg-[#0f0f0f]' : 'bg-white')
 const extraSteps = computed(() => {
-  return isPosthogAvailableInBuild()
+  return isAnalyticsAvailableInBuild()
     ? [{ id: 'analytics-notice', component: OnboardingStepAnalyticsNotice }]
     : []
 })
diff --git a/apps/stage-web/src/App.vue b/apps/stage-web/src/App.vue
index 78f4d3076..f0c747d83 100644
--- a/apps/stage-web/src/App.vue
+++ b/apps/stage-web/src/App.vue
@@ -2,7 +2,7 @@
 import { OnboardingDialog, OnboardingStepAnalyticsNotice, ToasterRoot } from '@proj-airi/stage-ui/components'
 import { useInferencePreload } from '@proj-airi/stage-ui/composables'
 import { useAuthProviderSync } from '@proj-airi/stage-ui/composables/use-auth-provider-sync'
-import { isPosthogAvailableInBuild, useSharedAnalyticsStore } from '@proj-airi/stage-ui/stores/analytics'
+import { isAnalyticsAvailableInBuild, useSharedAnalyticsStore } from '@proj-airi/stage-ui/stores/analytics'
 import { useCharacterOrchestratorStore } from '@proj-airi/stage-ui/stores/character'
 import { useChatSessionStore } from '@proj-airi/stage-ui/stores/chat/session-store'
 import { useDisplayModelsStore } from '@proj-airi/stage-ui/stores/display-models'
@@ -65,7 +65,7 @@ const colors = computed(() => {
 })
 
 const onboardingExtraSteps = computed(() => {
-  return isPosthogAvailableInBuild()
+  return isAnalyticsAvailableInBuild()
     ? [{ id: 'analytics-notice', component: OnboardingStepAnalyticsNotice }]
     : []
 })
diff --git a/apps/stage-web/src/main.ts b/apps/stage-web/src/main.ts
index 58c361083..7e986c12d 100644
--- a/apps/stage-web/src/main.ts
+++ b/apps/stage-web/src/main.ts
@@ -8,6 +8,7 @@ import { autoAnimatePlugin } from '@formkit/auto-animate/vue'
 import { PiniaColada } from '@pinia/colada'
 import { isEnvTruthy } from '@proj-airi/stage-shared'
 import { trackButtonPlugin } from '@proj-airi/stage-ui/directives/track-button'
+import { configureAnalyticsAdapter } from '@proj-airi/stage-ui/stores/analytics/client'
 import { MotionPlugin } from '@vueuse/motion'
 import { createPinia } from 'pinia'
 import { setupLayouts } from 'virtual:generated-layouts'
@@ -27,6 +28,11 @@ import 'vue-sonner/style.css'
 import './styles/main.css'
 import 'uno.css'
 
+configureAnalyticsAdapter(async (options) => {
+  const { createPosthogAdapter } = await import('@proj-airi/stage-ui/stores/analytics/posthog')
+  return createPosthogAdapter(options)
+})
+
 const pinia = createPinia()
 
 // TODO: vite-plugin-vue-layouts is long deprecated, replace with another layout solution
diff --git a/apps/stage-web/vite.config.ts b/apps/stage-web/vite.config.ts
index ba5c4b35d..c9070c4cd 100644
--- a/apps/stage-web/vite.config.ts
+++ b/apps/stage-web/vite.config.ts
@@ -91,6 +91,23 @@ export default defineConfig({
     },
   },
   build: {
+    manifest: true,
+    rolldownOptions: {
+      output: {
+        chunkFileNames: (chunkInfo) => {
+          const containsAnalyticsModule = chunkInfo.moduleIds.some((moduleId) => {
+            const normalizedModuleId = moduleId.replaceAll('\\', '/').toLowerCase()
+            return normalizedModuleId.includes('analytics') || normalizedModuleId.includes('posthog')
+          })
+
+          // Only analytics/provider chunks receive the manual neutral mapping;
+          // all unrelated chunks retain Vite's readable default naming.
+          return containsAnalyticsModule
+            ? 'assets/auxiliary-[hash].js'
+            : 'assets/[name]-[hash].js'
+        },
+      },
+    },
     sourcemap: true,
   },
   worker: {
diff --git a/apps/ui-server-auth/src/main.ts b/apps/ui-server-auth/src/main.ts
index d7e6e80c9..0faedfd8c 100644
--- a/apps/ui-server-auth/src/main.ts
+++ b/apps/ui-server-auth/src/main.ts
@@ -14,7 +14,7 @@ import { routes } from 'vue-router/auto-routes'
 
 import App from './App.vue'
 
-import { initAuthAnalytics } from './modules/analytics'
+import { loadAnalyticsAdapter } from './modules/analytics'
 import { AUTH_UI_ROUTER_BASE_PATH } from './modules/auth-ui-base'
 import { i18n } from './modules/i18n'
 
@@ -24,7 +24,12 @@ import 'vue-sonner/style.css'
 import './styles/main.css'
 import 'uno.css'
 
-initAuthAnalytics()
+if (isEnvTruthy(import.meta.env.VITE_ENABLE_POSTHOG)) {
+  void loadAnalyticsAdapter(async () => {
+    const { createPosthogAdapter } = await import('./modules/analytics-adapters/posthog')
+    return createPosthogAdapter()
+  })
+}
 
 const pinia = createPinia()
 
diff --git a/apps/ui-server-auth/src/modules/analytics-adapters/posthog.ts b/apps/ui-server-auth/src/modules/analytics-adapters/posthog.ts
new file mode 100644
index 000000000..2f7bf6dc9
--- /dev/null
+++ b/apps/ui-server-auth/src/modules/analytics-adapters/posthog.ts
@@ -0,0 +1,28 @@
+import type { AnalyticsAdapter } from '../analytics'
+
+import posthog from 'posthog-js'
+
+import {
+  DEFAULT_POSTHOG_CONFIG,
+  POSTHOG_PROJECT_KEY,
+} from '../../../../../posthog.config'
+
+/** Creates the auth analytics adapter and initializes its provider SDK. */
+export function createPosthogAdapter(): AnalyticsAdapter {
+  posthog.init(POSTHOG_PROJECT_KEY, { ...DEFAULT_POSTHOG_CONFIG })
+  // The shared project distinguishes auth traffic through this super property.
+  posthog.register({ app_surface: 'auth' })
+
+  return {
+    capture(event, properties, options) {
+      posthog.capture(
+        event,
+        properties,
+        options?.beforeNavigation ? { send_instantly: true, transport: 'sendBeacon' } : undefined,
+      )
+    },
+    identify(userId) {
+      posthog.identify(userId)
+    },
+  }
+}
diff --git a/apps/ui-server-auth/src/modules/analytics.test.ts b/apps/ui-server-auth/src/modules/analytics.test.ts
index 064e91966..8b958894f 100644
--- a/apps/ui-server-auth/src/modules/analytics.test.ts
+++ b/apps/ui-server-auth/src/modules/analytics.test.ts
@@ -1,28 +1,22 @@
+import type { AnalyticsAdapter } from './analytics'
+
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
-import { initAuthAnalytics, trackSignupFormCompleted } from './analytics'
+import {
+  AnalyticsClient,
+  loadAnalyticsAdapter,
+  trackSignupFormCompleted,
+} from './analytics'
 
-const posthogMocks = vi.hoisted(() => ({
+const adapterMocks = {
   capture: vi.fn(),
-  init: vi.fn(),
-  register: vi.fn(),
-}))
+  identify: vi.fn(),
+} satisfies AnalyticsAdapter
 
-vi.mock('posthog-js', () => ({
-  default: posthogMocks,
-}))
-
-vi.mock('../../../../posthog.config', () => ({
-  DEFAULT_POSTHOG_CONFIG: {},
-  POSTHOG_ENABLED: true,
-  POSTHOG_PROJECT_KEY: 'test-project-key',
-}))
-
-describe('auth product analytics', () => {
+describe('auth analytics', () => {
   beforeEach(() => {
-    posthogMocks.capture.mockClear()
-    posthogMocks.init.mockClear()
-    posthogMocks.register.mockClear()
+    adapterMocks.capture.mockClear()
+    adapterMocks.identify.mockClear()
   })
 
   // ROOT CAUSE:
@@ -33,16 +27,49 @@ describe('auth product analytics', () => {
   //
   // The anonymous UI milestone must use its own name. The identified server
   // event remains the only canonical `signup_completed` business fact.
-  it('keeps anonymous signup UI completion separate from the canonical server signup fact', () => {
-    expect(initAuthAnalytics()).toBe(true)
-    expect(posthogMocks.register).toHaveBeenCalledWith({ app_surface: 'auth' })
+  it('keeps anonymous signup UI completion separate from the canonical server signup fact', async () => {
+    await expect(loadAnalyticsAdapter(async () => adapterMocks)).resolves.toBe(true)
 
     trackSignupFormCompleted({ source: 'email', requires_verification: true })
 
-    expect(posthogMocks.capture).toHaveBeenCalledWith(
+    expect(adapterMocks.capture).toHaveBeenCalledWith(
       'signup_form_completed',
       { source: 'email', requires_verification: true },
-      undefined,
+      { beforeNavigation: false },
     )
   })
+
+  it('flushes calls made while the optional adapter is loading', async () => {
+    const client = new AnalyticsClient()
+    let install: ((adapter: AnalyticsAdapter) => void) | undefined
+    const loading = client.load(() => new Promise<AnalyticsAdapter>((resolve) => {
+      install = resolve
+    }))
+
+    client.capture('login_started', { method: 'github' }, { beforeNavigation: true })
+    client.identify('user-1')
+    await Promise.resolve()
+    install?.(adapterMocks)
+
+    await expect(loading).resolves.toBe(true)
+    expect(adapterMocks.capture).toHaveBeenCalledWith(
+      'login_started',
+      { method: 'github' },
+      { beforeNavigation: true },
+    )
+    expect(adapterMocks.identify).toHaveBeenCalledWith('user-1')
+  })
+
+  it('becomes a harmless no-op when a content blocker rejects the adapter import', async () => {
+    const client = new AnalyticsClient()
+    const loading = client.load(async () => {
+      throw new TypeError('Failed to fetch dynamically imported module')
+    })
+
+    client.capture('login_started', { method: 'google' })
+
+    await expect(loading).resolves.toBe(false)
+    expect(() => client.capture('login_failed', { method: 'google' })).not.toThrow()
+    expect(adapterMocks.capture).not.toHaveBeenCalled()
+  })
 })
diff --git a/apps/ui-server-auth/src/modules/analytics.ts b/apps/ui-server-auth/src/modules/analytics.ts
index ab2e9c3d5..94abb67a3 100644
--- a/apps/ui-server-auth/src/modules/analytics.ts
+++ b/apps/ui-server-auth/src/modules/analytics.ts
@@ -1,5 +1,5 @@
 /**
- * PostHog product analytics for the auth-only SPA (`apps/ui-server-auth`).
+ * Provider-neutral analytics for the auth-only SPA (`apps/ui-server-auth`).
  *
  * This surface captures anonymous auth-UI milestones such as form completion,
  * sign-in attempts, email verification, and password recovery. Canonical
@@ -9,44 +9,120 @@
  *
  * Unlike the stage apps there is no in-app analytics consent toggle here
  * (the user isn't signed in yet, so there's no settings store to read).
- * Capture posture matches the docs site: enabled in analytics-enabled
- * builds (`VITE_ENABLE_POSTHOG`), disclosed via the privacy policy linked
- * on the sign-in page.
+ * Capture posture matches the docs site: the optional provider is enabled by
+ * the application entry in configured builds and disclosed via the privacy
+ * policy linked on the sign-in page.
  */
 
 import type { OauthCallbackFailureStage } from '@proj-airi/stage-ui/composables'
 
-import posthog from 'posthog-js'
-
-import {
-  DEFAULT_POSTHOG_CONFIG,
-  POSTHOG_ENABLED,
-  POSTHOG_PROJECT_KEY,
-} from '../../../../posthog.config'
-
 /** Login/signup credential kinds shown on the sign-in page. */
 export type AuthMethod = 'email' | 'github' | 'google'
 
-let initialized = false
+interface CaptureOptions {
+  /**
+   * Set when navigation immediately follows capture. Adapters can select a
+   * transport that survives document unload.
+   */
+  beforeNavigation?: boolean
+}
+
+/** Adapter contract installed by an optional analytics provider chunk. */
+export interface AnalyticsAdapter {
+  capture: (event: string, properties: Record<string, unknown>, options?: CaptureOptions) => void
+  identify: (userId: string) => void
+}
+
+type PendingOperation
+  = | { kind: 'capture', event: string, properties: Record<string, unknown>, options?: CaptureOptions }
+    | { kind: 'identify', userId: string }
+
+type LoadState = 'idle' | 'loading' | 'ready' | 'unavailable'
 
 /**
- * Initialize PostHog for the auth surface. Call once from `main.ts` before
- * mount; later calls are no-ops. Returns whether capture is active so
- * callers can skip building event payloads in analytics-disabled builds.
+ * Owns optional-adapter loading and guarantees that product-event calls never
+ * make core auth UI wait for, or depend on, a provider SDK.
  */
-export function initAuthAnalytics(): boolean {
-  if (!POSTHOG_ENABLED)
-    return false
+export class AnalyticsClient {
+  private adapter: AnalyticsAdapter | undefined
+  private loadPromise: Promise<boolean> | undefined
+  private loadState: LoadState = 'idle'
+  private readonly pendingOperations: PendingOperation[] = []
 
-  if (initialized)
-    return true
+  load(loader: () => Promise<AnalyticsAdapter>): Promise<boolean> {
+    if (this.loadPromise)
+      return this.loadPromise
 
-  posthog.init(POSTHOG_PROJECT_KEY, { ...DEFAULT_POSTHOG_CONFIG })
-  // Same single-project setup as the stage apps: the `app_surface` super
-  // property is how auth traffic is told apart in shared dashboards.
-  posthog.register({ app_surface: 'auth' })
-  initialized = true
-  return true
+    this.loadState = 'loading'
+    this.loadPromise = Promise.resolve()
+      .then(loader)
+      .then((adapter) => {
+        this.adapter = adapter
+        this.loadState = 'ready'
+        this.flush()
+        return true
+      })
+      .catch(() => {
+        // Content blockers commonly reject the provider's module request. The
+        // provider is optional, so discard queued telemetry and stay no-op.
+        this.pendingOperations.length = 0
+        this.loadState = 'unavailable'
+        return false
+      })
+
+    return this.loadPromise
+  }
+
+  capture(event: string, properties: Record<string, unknown>, options?: CaptureOptions): void {
+    if (this.adapter) {
+      this.adapter.capture(event, properties, options)
+      return
+    }
+
+    if (this.loadState === 'loading')
+      this.enqueue({ kind: 'capture', event, properties, options })
+  }
+
+  identify(userId: string): void {
+    if (this.adapter) {
+      this.adapter.identify(userId)
+      return
+    }
+
+    if (this.loadState === 'loading')
+      this.enqueue({ kind: 'identify', userId })
+  }
+
+  private enqueue(operation: PendingOperation): void {
+    // A provider may remain slow indefinitely. Bound memory while preserving
+    // the newest auth funnel steps, which are the most useful after recovery.
+    if (this.pendingOperations.length === 100)
+      this.pendingOperations.shift()
+    this.pendingOperations.push(operation)
+  }
+
+  private flush(): void {
+    if (!this.adapter)
+      return
+
+    for (const operation of this.pendingOperations) {
+      if (operation.kind === 'identify')
+        this.adapter.identify(operation.userId)
+      else
+        this.adapter.capture(operation.event, operation.properties, operation.options)
+    }
+    this.pendingOperations.length = 0
+  }
+}
+
+const analytics = new AnalyticsClient()
+
+/**
+ * Starts loading the optional provider adapter without exposing its SDK to
+ * pages or to the application's static module graph.
+ */
+export function loadAnalyticsAdapter(loader: () => Promise<AnalyticsAdapter>): Promise<boolean> {
+  return analytics.load(loader)
 }
 
 /**
@@ -55,29 +131,11 @@ export function initAuthAnalytics(): boolean {
  * uses as `distinctId` (see `apps/server` product events forwarding).
  */
 export function identifyAuthUser(userId: string): void {
-  if (!initialized)
-    return
-  posthog.identify(userId)
-}
-
-interface CaptureOptions {
-  /**
-   * Set when navigation immediately follows the capture call
-   * (`window.location.href = ...`). The batched queue would race the
-   * unload and drop the event; sendBeacon survives it.
-   */
-  beforeNavigation?: boolean
+  analytics.identify(userId)
 }
 
 function capture(event: string, properties: Record<string, unknown>, options?: CaptureOptions): void {
-  if (!initialized)
-    return
-
-  posthog.capture(
-    event,
-    properties,
-    options?.beforeNavigation ? { send_instantly: true, transport: 'sendBeacon' } : undefined,
-  )
+  analytics.capture(event, properties, options)
 }
 
 /** Anonymous email-signup UI milestone; the server owns the registration fact. */
diff --git a/apps/ui-server-auth/vite.config.ts b/apps/ui-server-auth/vite.config.ts
index 0441c55f0..23afb1ccb 100644
--- a/apps/ui-server-auth/vite.config.ts
+++ b/apps/ui-server-auth/vite.config.ts
@@ -45,18 +45,22 @@ export default defineConfig({
   },
   build: {
     emptyOutDir: true,
+    manifest: true,
     outDir: resolve(join(import.meta.dirname, 'dist')),
     rolldownOptions: {
       output: {
-        // NOTICE:
-        // Safari content blockers can reject application chunks solely because a
-        // semantic filename such as `analytics-*.js` matches a filtering rule.
-        // Root cause: auth analytics is currently shared by the entry and routes,
-        // so blocking that generated chunk prevents the Vue app from mounting.
-        // Source/context: `apps/ui-server-auth/src/modules/analytics.ts`.
-        // Removal condition: analytics is no longer an application-critical static
-        // dependency and blocked optional modules cannot prevent app startup.
-        chunkFileNames: 'assets/chunk-[hash].js',
+        chunkFileNames: (chunkInfo) => {
+          const containsAnalyticsModule = chunkInfo.moduleIds.some((moduleId) => {
+            const normalizedModuleId = moduleId.replaceAll('\\', '/').toLowerCase()
+            return normalizedModuleId.includes('analytics') || normalizedModuleId.includes('posthog')
+          })
+
+          // Keep analytics as the source-domain name, but explicitly map its
+          // public URL to a neutral chunk name that filter lists cannot infer.
+          return containsAnalyticsModule
+            ? 'assets/chunk-[hash].js'
+            : 'assets/[name]-[hash].js'
+        },
       },
     },
     sourcemap: true,
diff --git a/packages/stage-pages/src/components/settings-general-fields.vue b/packages/stage-pages/src/components/settings-general-fields.vue
index e36c79c39..9f6e70f27 100644
--- a/packages/stage-pages/src/components/settings-general-fields.vue
+++ b/packages/stage-pages/src/components/settings-general-fields.vue
@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { all } from '@proj-airi/i18n'
 import { useAnalytics } from '@proj-airi/stage-ui/composables/use-analytics'
-import { isPosthogAvailableInBuild } from '@proj-airi/stage-ui/stores/analytics'
+import { isAnalyticsAvailableInBuild } from '@proj-airi/stage-ui/stores/analytics'
 import { useSettings } from '@proj-airi/stage-ui/stores/settings'
 import { FieldCheckbox, FieldCombobox, useTheme } from '@proj-airi/ui'
 import { computed } from 'vue'
@@ -16,7 +16,7 @@ const props = withDefaults(defineProps<{
 const settings = useSettings()
 
 const showControlsIsland = computed(() => props.needsControlsIslandIconSizeSetting)
-const showAnalyticsSettings = computed(() => isPosthogAvailableInBuild())
+const showAnalyticsSettings = computed(() => isAnalyticsAvailableInBuild())
 const analyticsToggleValue = computed({
   get: () => showAnalyticsSettings.value ? settings.analyticsEnabled : false,
   set: (value: boolean) => settings.analyticsEnabled = value,
diff --git a/packages/stage-ui/package.json b/packages/stage-ui/package.json
index 22794556a..de0ad79c3 100644
--- a/packages/stage-ui/package.json
+++ b/packages/stage-ui/package.json
@@ -35,6 +35,7 @@
     "./tools/mcp": "./src/tools/mcp.ts",
     "./stores/providers/aliyun": "./src/stores/providers/aliyun/index.ts",
     "./stores/analytics": "./src/stores/analytics/index.ts",
+    "./stores/analytics/client": "./src/stores/analytics/client.ts",
     "./stores/analytics/posthog": "./src/stores/analytics/posthog.ts",
     "./stores/analytics/privacy-policy": "./src/stores/analytics/privacy-policy.ts",
     "./stores/character": "./src/stores/character/index.ts",
diff --git a/packages/stage-ui/src/composables/use-analytics.test.ts b/packages/stage-ui/src/composables/use-analytics.test.ts
index ee5e0f6b0..65f8108ba 100644
--- a/packages/stage-ui/src/composables/use-analytics.test.ts
+++ b/packages/stage-ui/src/composables/use-analytics.test.ts
@@ -4,10 +4,10 @@ import { ref } from 'vue'
 import { useAnalytics } from './use-analytics'
 
 const analyticsMocks = vi.hoisted(() => ({
-  ensurePosthogInitializedMock: vi.fn(() => true),
+  ensureAnalyticsInitializedMock: vi.fn(() => true),
   isStageCapacitorMock: vi.fn(() => false),
   isStageTamagotchiMock: vi.fn(() => false),
-  isPosthogAvailableInBuildMock: vi.fn(() => true),
+  isAnalyticsAvailableInBuildMock: vi.fn(() => true),
   markFirstMessageTrackedMock: vi.fn(),
   posthogCaptureMock: vi.fn(),
 }))
@@ -17,12 +17,6 @@ vi.mock('@proj-airi/stage-shared', () => ({
   isStageTamagotchi: analyticsMocks.isStageTamagotchiMock,
 }))
 
-vi.mock('posthog-js', () => ({
-  default: {
-    capture: analyticsMocks.posthogCaptureMock,
-  },
-}))
-
 vi.mock('vue-i18n', () => ({
   useI18n: () => ({
     locale: ref('en'),
@@ -37,9 +31,10 @@ vi.mock('../stores/analytics', () => ({
   }),
 }))
 
-vi.mock('../stores/analytics/posthog', () => ({
-  ensurePosthogInitialized: analyticsMocks.ensurePosthogInitializedMock,
-  isPosthogAvailableInBuild: analyticsMocks.isPosthogAvailableInBuildMock,
+vi.mock('../stores/analytics/client', () => ({
+  captureAnalyticsEvent: analyticsMocks.posthogCaptureMock,
+  ensureAnalyticsInitialized: analyticsMocks.ensureAnalyticsInitializedMock,
+  isAnalyticsAvailableInBuild: analyticsMocks.isAnalyticsAvailableInBuildMock,
 }))
 
 vi.mock('../stores/analytics/privacy-policy', () => ({
@@ -62,12 +57,12 @@ describe('useAnalytics conversation product events', () => {
   beforeEach(() => {
     analyticsMocks.posthogCaptureMock.mockClear()
     analyticsMocks.markFirstMessageTrackedMock.mockClear()
-    analyticsMocks.ensurePosthogInitializedMock.mockClear()
+    analyticsMocks.ensureAnalyticsInitializedMock.mockClear()
     analyticsMocks.isStageCapacitorMock.mockReset()
     analyticsMocks.isStageTamagotchiMock.mockReset()
     analyticsMocks.isStageCapacitorMock.mockReturnValue(false)
     analyticsMocks.isStageTamagotchiMock.mockReturnValue(false)
-    analyticsMocks.isPosthogAvailableInBuildMock.mockClear()
+    analyticsMocks.isAnalyticsAvailableInBuildMock.mockClear()
   })
 
   it('uses app_surface for the web runtime without occupying the event entry surface', () => {
@@ -513,10 +508,7 @@ describe('useAnalytics conversation product events', () => {
       currency: 'USD',
       entry_surface: 'settings_flux',
       plan_id: 'price-1',
-    }, {
-      send_instantly: true,
-      transport: 'sendBeacon',
-    })
+    }, { beforeNavigation: true })
   })
 
   /**
@@ -938,7 +930,7 @@ describe('useAnalytics conversation product events', () => {
       3,
       'oauth_provider_link_started',
       { app_surface: 'web', provider: 'github' },
-      { send_instantly: true, transport: 'sendBeacon' },
+      { beforeNavigation: true },
     )
     expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(4, 'oauth_provider_unlinked', {
       app_surface: 'web',
@@ -1012,7 +1004,7 @@ describe('useAnalytics conversation product events', () => {
         action: 'refresh_window',
         app_surface: 'electron',
       },
-      { send_instantly: true, transport: 'sendBeacon' },
+      { beforeNavigation: true },
     )
   })
 
@@ -1030,7 +1022,7 @@ describe('useAnalytics conversation product events', () => {
     analytics.trackMcpConnectionTestRun({ success: false })
     analytics.trackDevicePairingQrShown()
 
-    expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(1, 'spotlight_used')
+    expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(1, 'spotlight_used', {})
     expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(2, 'widget_opened', { widget_id: 'weather' })
     expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(3, 'update_check_clicked', { channel: 'auto' })
     expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(4, 'update_downloaded', { channel: 'stable', version: '0.11.0' })
@@ -1038,11 +1030,11 @@ describe('useAnalytics conversation product events', () => {
       5,
       'update_install_clicked',
       { channel: 'stable', version: '0.11.0' },
-      { send_instantly: true, transport: 'sendBeacon' },
+      { beforeNavigation: true },
     )
-    expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(6, 'mcp_server_added')
-    expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(7, 'mcp_server_removed')
+    expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(6, 'mcp_server_added', {})
+    expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(7, 'mcp_server_removed', {})
     expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(8, 'mcp_connection_test_run', { success: false })
-    expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(9, 'device_pairing_qr_shown')
+    expect(analyticsMocks.posthogCaptureMock).toHaveBeenNthCalledWith(9, 'device_pairing_qr_shown', {})
   })
 })
diff --git a/packages/stage-ui/src/composables/use-analytics.ts b/packages/stage-ui/src/composables/use-analytics.ts
index 0bb573085..1b89b2f1c 100644
--- a/packages/stage-ui/src/composables/use-analytics.ts
+++ b/packages/stage-ui/src/composables/use-analytics.ts
@@ -1,15 +1,13 @@
 import type { ControlsIslandAction } from '../stores/analytics/button-events'
 import type { SpeechOutputStopReason } from '../stores/speech-output-control'
 
-import posthog from 'posthog-js'
-
 import { isStageCapacitor, isStageTamagotchi } from '@proj-airi/stage-shared'
 import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 
 import { useSharedAnalyticsStore } from '../stores/analytics'
 import { captureTrackButtonEvent } from '../stores/analytics/button-events'
-import { ensurePosthogInitialized, isPosthogAvailableInBuild } from '../stores/analytics/posthog'
+import { captureAnalyticsEvent, ensureAnalyticsInitialized, isAnalyticsAvailableInBuild } from '../stores/analytics/client'
 import { getAnalyticsPrivacyPolicyUrl } from '../stores/analytics/privacy-policy'
 import { useSettingsAnalytics } from '../stores/settings/analytics'
 import { useSettingsGeneral } from '../stores/settings/general'
@@ -133,21 +131,20 @@ export function useAnalytics() {
 
   const privacyPolicyUrl = computed(() => getAnalyticsPrivacyPolicyUrl(locale.value || settingsGeneral.language))
 
-  const isAnalyticsEnabled = computed(() => isPosthogAvailableInBuild() && settingsAnalytics.analyticsEnabled)
+  const isAnalyticsEnabled = computed(() => isAnalyticsAvailableInBuild() && settingsAnalytics.analyticsEnabled)
 
   function canCapture(): boolean {
     if (!isAnalyticsEnabled.value)
       return false
 
-    // Ensure PostHog is initialized before any capture call.
-    return ensurePosthogInitialized(true)
+    return ensureAnalyticsInitialized(true)
   }
 
   function trackProviderClick(providerId: string, module: string) {
     if (!canCapture())
       return
 
-    posthog.capture('provider_card_clicked', {
+    captureAnalyticsEvent('provider_card_clicked', {
       provider_id: providerId,
       module,
     })
@@ -168,7 +165,7 @@ export function useAnalytics() {
       ? Date.now() - analyticsStore.appStartTime
       : null
 
-    posthog.capture('first_message_sent', {
+    captureAnalyticsEvent('first_message_sent', {
       time_to_first_message_ms: timeToFirstMessageMs,
     })
   }
@@ -189,7 +186,7 @@ export function useAnalytics() {
   function trackPricingViewed(entrySurface: string, planPeriod?: 'monthly' | 'annual' | 'one_time') {
     if (!canCapture())
       return
-    posthog.capture('pricing_page_viewed', { entry_surface: entrySurface, ...(planPeriod && { plan_period: planPeriod }) })
+    captureAnalyticsEvent('pricing_page_viewed', { entry_surface: entrySurface, ...(planPeriod && { plan_period: planPeriod }) })
   }
 
   /**
@@ -199,7 +196,7 @@ export function useAnalytics() {
   function trackPlanSelected(planId: string, properties: { entry_surface: string, price_minor_unit?: number, currency?: string }) {
     if (!canCapture())
       return
-    posthog.capture('plan_selected', { plan_id: planId, ...properties })
+    captureAnalyticsEvent('plan_selected', { plan_id: planId, ...properties })
   }
 
   /**
@@ -209,10 +206,8 @@ export function useAnalytics() {
    *
    * Expects:
    * - Caller awaits or fire-and-forgets this call immediately before
-   *   `window.location.href = ...`. We pass `send_instantly: true` and
-   *   `transport: 'sendBeacon'` so the event survives page navigation —
-   *   the regular batched queue would race the redirect and drop the
-   *   event, which breaks the funnel.
+   *   `window.location.href = ...`. `beforeNavigation` lets the installed
+   *   adapter choose a delivery mechanism that survives document unload.
    *
    * The funnel terminator `payment_completed` is forwarded to PostHog
    * server-side by the product-events service (allowlist in
@@ -222,10 +217,10 @@ export function useAnalytics() {
   function trackCheckoutStarted(planId: string, properties: { entry_surface: string, checkout_session_id?: string, price_minor_unit?: number, currency?: string }) {
     if (!canCapture())
       return
-    posthog.capture(
+    captureAnalyticsEvent(
       'checkout_started',
       { plan_id: planId, ...properties },
-      { send_instantly: true, transport: 'sendBeacon' },
+      { beforeNavigation: true },
     )
   }
 
@@ -236,7 +231,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('paywall_seen', {
+    captureAnalyticsEvent('paywall_seen', {
       entry_surface: properties.entry_surface,
       app_surface: getConversationAnalyticsSurface(),
       reason: properties.reason,
@@ -254,7 +249,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('oauth_callback_failed', {
+    captureAnalyticsEvent('oauth_callback_failed', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -266,13 +261,13 @@ export function useAnalytics() {
   function trackPasswordChanged() {
     if (!canCapture())
       return
-    posthog.capture('password_changed', { app_surface: getConversationAnalyticsSurface() })
+    captureAnalyticsEvent('password_changed', { app_surface: getConversationAnalyticsSurface() })
   }
 
   function trackPasswordResetRequested() {
     if (!canCapture())
       return
-    posthog.capture('password_reset_requested', { app_surface: getConversationAnalyticsSurface() })
+    captureAnalyticsEvent('password_reset_requested', { app_surface: getConversationAnalyticsSurface() })
   }
 
   function trackOauthProviderLinkStarted(properties: { provider: string }) {
@@ -281,20 +276,20 @@ export function useAnalytics() {
     // The only caller (`useLinkedAccounts.link`) navigates to the OAuth
     // consent page right after this hook — the batched queue would race
     // the unload and drop the event, same as `trackCheckoutStarted`.
-    posthog.capture(
+    captureAnalyticsEvent(
       'oauth_provider_link_started',
       {
         ...properties,
         app_surface: getConversationAnalyticsSurface(),
       },
-      { send_instantly: true, transport: 'sendBeacon' },
+      { beforeNavigation: true },
     )
   }
 
   function trackOauthProviderUnlinked(properties: { provider: string }) {
     if (!canCapture())
       return
-    posthog.capture('oauth_provider_unlinked', {
+    captureAnalyticsEvent('oauth_provider_unlinked', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -308,13 +303,13 @@ export function useAnalytics() {
   function trackAccountDeletionRequested() {
     if (!canCapture())
       return
-    posthog.capture('account_deletion_requested', { app_surface: getConversationAnalyticsSurface() })
+    captureAnalyticsEvent('account_deletion_requested', { app_surface: getConversationAnalyticsSurface() })
   }
 
   function trackOnboardingStarted(properties: { entry: ProductAnalyticsEntry }) {
     if (!canCapture())
       return
-    posthog.capture('onboarding_started', {
+    captureAnalyticsEvent('onboarding_started', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -323,7 +318,7 @@ export function useAnalytics() {
   function trackOnboardingCompleted(properties: OnboardingProviderProperties) {
     if (!canCapture())
       return
-    posthog.capture('onboarding_completed', {
+    captureAnalyticsEvent('onboarding_completed', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -333,14 +328,14 @@ export function useAnalytics() {
   function trackCharacterCreated(properties: { character_type: 'built_in' | 'custom', voice_enabled: boolean }) {
     if (!canCapture())
       return
-    posthog.capture('character_created', properties)
+    captureAnalyticsEvent('character_created', properties)
   }
 
   /** Feature adoption — voice mode is a candidate retention lever; cohort comparisons live in PostHog. */
   function trackVoiceModeActivated(characterId?: string) {
     if (!canCapture())
       return
-    posthog.capture('voice_mode_activated', characterId ? { character_id: characterId } : {})
+    captureAnalyticsEvent('voice_mode_activated', characterId ? { character_id: characterId } : {})
   }
 
   /**
@@ -351,8 +346,8 @@ export function useAnalytics() {
   function trackModelSwitched(fromModel: string, toModel: string, reason: 'manual' | 'auto' = 'manual') {
     if (!canCapture())
       return
-    posthog.capture('model_switched', { from_model: fromModel, to_model: toModel, reason })
-    posthog.capture('model_changed', {
+    captureAnalyticsEvent('model_switched', { from_model: fromModel, to_model: toModel, reason })
+    captureAnalyticsEvent('model_changed', {
       from_model: fromModel,
       to_model: toModel,
       reason,
@@ -368,7 +363,7 @@ export function useAnalytics() {
   function trackChatSessionStarted(modelId: string, sessionIndex?: number) {
     if (!canCapture())
       return
-    posthog.capture('chat_session_started', { model_id: modelId, ...(sessionIndex != null && { session_index: sessionIndex }) })
+    captureAnalyticsEvent('chat_session_started', { model_id: modelId, ...(sessionIndex != null && { session_index: sessionIndex }) })
   }
 
   // ─── LLM round events (client-known fields only) ──────────────────────
@@ -381,27 +376,27 @@ export function useAnalytics() {
   function trackMessageSendStarted(properties: ChatRoundCorrelationProperties & { source: 'text' | 'voice', model?: string }) {
     if (!canCapture())
       return
-    posthog.capture('message_send_started', properties)
+    captureAnalyticsEvent('message_send_started', properties)
   }
 
   function trackLlmRequestStarted(properties: ChatRoundCorrelationProperties & { model: string, provider: string, has_voice: boolean }) {
     if (!canCapture())
       return
-    posthog.capture('llm_request_started', properties)
+    captureAnalyticsEvent('llm_request_started', properties)
   }
 
   /** First token from a streaming LLM response — perceived responsiveness anchor. */
   function trackLlmFirstToken(properties: ChatRoundCorrelationProperties & { model: string, ttfb_ms: number }) {
     if (!canCapture())
       return
-    posthog.capture('llm_first_token', properties)
+    captureAnalyticsEvent('llm_first_token', properties)
   }
 
   /** Stream finished and the UI has fully rendered the assistant message. */
   function trackAssistantResponseRendered(properties: ChatRoundCorrelationProperties & { model: string, latency_ms: number }) {
     if (!canCapture())
       return
-    posthog.capture('assistant_response_rendered', properties)
+    captureAnalyticsEvent('assistant_response_rendered', properties)
   }
 
   /** Cost-fact event for one custom-provider generation; content is intentionally excluded. */
@@ -424,7 +419,7 @@ export function useAnalytics() {
         ? properties.input_tokens + properties.output_tokens
         : undefined)
 
-    posthog.capture('$ai_generation', {
+    captureAnalyticsEvent('$ai_generation', {
       $ai_trace_id: properties.conversation_id,
       $ai_session_id: properties.conversation_id,
       $ai_span_id: properties.round_id,
@@ -459,7 +454,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('message_round', properties)
+    captureAnalyticsEvent('message_round', properties)
   }
 
   /** Canonical failure event for every user-to-assistant round, including post-activation turns. */
@@ -472,7 +467,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('message_round_failed', {
+    captureAnalyticsEvent('message_round_failed', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -483,7 +478,7 @@ export function useAnalytics() {
   function trackChatActivationStarted(properties: ChatActivationBaseProperties) {
     if (!canCapture())
       return
-    posthog.capture('chat_activation_started', {
+    captureAnalyticsEvent('chat_activation_started', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -492,7 +487,7 @@ export function useAnalytics() {
   function trackChatActivationSucceeded(properties: ChatActivationBaseProperties & { time_to_first_message_ms?: number }) {
     if (!canCapture())
       return
-    posthog.capture('chat_activation_succeeded', {
+    captureAnalyticsEvent('chat_activation_succeeded', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -504,7 +499,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('chat_activation_failed', {
+    captureAnalyticsEvent('chat_activation_failed', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -519,7 +514,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('official_provider_selected', {
+    captureAnalyticsEvent('official_provider_selected', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -536,7 +531,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('message_sent', {
+    captureAnalyticsEvent('message_sent', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -545,7 +540,7 @@ export function useAnalytics() {
   function trackSecondTurnStarted(properties: ChatActivationBaseProperties) {
     if (!canCapture())
       return
-    posthog.capture('second_turn_started', {
+    captureAnalyticsEvent('second_turn_started', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -559,7 +554,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('model_list_loaded', {
+    captureAnalyticsEvent('model_list_loaded', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -573,7 +568,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('model_list_failed', {
+    captureAnalyticsEvent('model_list_failed', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -582,7 +577,7 @@ export function useAnalytics() {
   function trackProviderConfigStarted(properties: ProviderConfigBaseProperties) {
     if (!canCapture())
       return
-    posthog.capture('provider_config_started', {
+    captureAnalyticsEvent('provider_config_started', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -591,7 +586,7 @@ export function useAnalytics() {
   function trackProviderConfigSucceeded(properties: ProviderConfigBaseProperties & { duration_ms: number }) {
     if (!canCapture())
       return
-    posthog.capture('provider_config_succeeded', {
+    captureAnalyticsEvent('provider_config_succeeded', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -613,7 +608,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('provider_config_failed', {
+    captureAnalyticsEvent('provider_config_failed', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -626,7 +621,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('provider_config_completed', {
+    captureAnalyticsEvent('provider_config_completed', {
       ...properties,
       provider_type: properties.provider_mode,
       provider_name: properties.provider_id,
@@ -641,7 +636,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('official_provider_enabled', {
+    captureAnalyticsEvent('official_provider_enabled', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -652,7 +647,7 @@ export function useAnalytics() {
   function trackTtsStopClicked(properties: { reason: SpeechOutputStopReason }) {
     if (!canCapture())
       return
-    posthog.capture('tts_stop_clicked', {
+    captureAnalyticsEvent('tts_stop_clicked', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -664,7 +659,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('speech_mute_toggled', {
+    captureAnalyticsEvent('speech_mute_toggled', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -673,7 +668,7 @@ export function useAnalytics() {
   function trackChatSessionSelected(properties: { source: 'sessions_drawer', message_count: number, cloud_synced: boolean }) {
     if (!canCapture())
       return
-    posthog.capture('chat_session_selected', {
+    captureAnalyticsEvent('chat_session_selected', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -682,7 +677,7 @@ export function useAnalytics() {
   function trackChatMessageDeleted(properties: { source: 'history', message_role: string }) {
     if (!canCapture())
       return
-    posthog.capture('chat_message_deleted', {
+    captureAnalyticsEvent('chat_message_deleted', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -691,7 +686,7 @@ export function useAnalytics() {
   function trackChatMessagesCleared(properties: { source: 'chat_controls', message_count: number }) {
     if (!canCapture())
       return
-    posthog.capture('chat_messages_cleared', {
+    captureAnalyticsEvent('chat_messages_cleared', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -700,7 +695,7 @@ export function useAnalytics() {
   function trackChatMessageRetried(properties: { source: 'history' }) {
     if (!canCapture())
       return
-    posthog.capture('chat_message_retried', {
+    captureAnalyticsEvent('chat_message_retried', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -714,7 +709,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('conversation_created', {
+    captureAnalyticsEvent('conversation_created', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -726,7 +721,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('conversation_renamed', {
+    captureAnalyticsEvent('conversation_renamed', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -738,7 +733,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('conversation_shared', {
+    captureAnalyticsEvent('conversation_shared', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -751,7 +746,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('conversation_deleted', {
+    captureAnalyticsEvent('conversation_deleted', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -762,29 +757,29 @@ export function useAnalytics() {
   function trackSttStarted(provider: string) {
     if (!canCapture())
       return
-    posthog.capture('stt_started', { provider })
+    captureAnalyticsEvent('stt_started', { provider })
   }
 
   function trackSttSucceeded(properties: { provider: string, latency_ms: number, char_count: number, stream: boolean }) {
     if (!canCapture())
       return
-    posthog.capture('stt_succeeded', properties)
+    captureAnalyticsEvent('stt_succeeded', properties)
   }
 
   function trackSttFailed(properties: { provider: string, error_code?: string }) {
     if (!canCapture())
       return
-    posthog.capture('stt_failed', properties)
+    captureAnalyticsEvent('stt_failed', properties)
   }
 
   function trackVoiceInputStarted(properties: VoiceInputBaseProperties) {
     if (!canCapture())
       return
-    posthog.capture('voice_input_started', {
+    captureAnalyticsEvent('voice_input_started', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
-    posthog.capture('voice_input_used', {
+    captureAnalyticsEvent('voice_input_used', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -793,7 +788,7 @@ export function useAnalytics() {
   function trackMicrophonePermissionRequested(properties: VoiceInputBaseProperties) {
     if (!canCapture())
       return
-    posthog.capture('microphone_permission_requested', {
+    captureAnalyticsEvent('microphone_permission_requested', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -802,7 +797,7 @@ export function useAnalytics() {
   function trackMicrophonePermissionDenied(properties: VoiceInputBaseProperties & { error_code?: 'permission_denied' | string }) {
     if (!canCapture())
       return
-    posthog.capture('microphone_permission_denied', {
+    captureAnalyticsEvent('microphone_permission_denied', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -811,7 +806,7 @@ export function useAnalytics() {
   function trackAudioDeviceUnavailable(properties: VoiceInputBaseProperties & { error_code?: 'device_unavailable' | string }) {
     if (!canCapture())
       return
-    posthog.capture('audio_device_unavailable', {
+    captureAnalyticsEvent('audio_device_unavailable', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -820,7 +815,7 @@ export function useAnalytics() {
   function trackVoiceInputCancelled(properties: VoiceInputBaseProperties) {
     if (!canCapture())
       return
-    posthog.capture('voice_input_cancelled', {
+    captureAnalyticsEvent('voice_input_cancelled', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -835,7 +830,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('bug_report_submitted', {
+    captureAnalyticsEvent('bug_report_submitted', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -844,7 +839,7 @@ export function useAnalytics() {
   function trackFeedbackSubmitted(properties: FeedbackBaseProperties) {
     if (!canCapture())
       return
-    posthog.capture('feedback_submitted', {
+    captureAnalyticsEvent('feedback_submitted', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -855,13 +850,13 @@ export function useAnalytics() {
   function trackPttPressed() {
     if (!canCapture())
       return
-    posthog.capture('ptt_pressed')
+    captureAnalyticsEvent('ptt_pressed', {})
   }
 
   function trackPttReleased(holdMs: number) {
     if (!canCapture())
       return
-    posthog.capture('ptt_released', { hold_ms: holdMs })
+    captureAnalyticsEvent('ptt_released', { hold_ms: holdMs })
   }
 
   // ─── TTS events (forwarded from speech bus by use-speech-pipeline-analytics) ─
@@ -872,25 +867,25 @@ export function useAnalytics() {
   function trackTtsIntentStarted(properties: { intent_id: string, turn_id?: string }) {
     if (!canCapture())
       return
-    posthog.capture('tts_intent_started', properties)
+    captureAnalyticsEvent('tts_intent_started', properties)
   }
 
   function trackTtsIntentEnded(properties: { intent_id: string, turn_id?: string, duration_ms: number }) {
     if (!canCapture())
       return
-    posthog.capture('tts_intent_ended', properties)
+    captureAnalyticsEvent('tts_intent_ended', properties)
   }
 
   function trackTtsIntentCancelled(properties: { intent_id: string, turn_id?: string, reason?: string }) {
     if (!canCapture())
       return
-    posthog.capture('tts_intent_cancelled', properties)
+    captureAnalyticsEvent('tts_intent_cancelled', properties)
   }
 
   function trackTtsProviderSelected(properties: TtsVoiceBaseProperties) {
     if (!canCapture())
       return
-    posthog.capture('tts_provider_selected', {
+    captureAnalyticsEvent('tts_provider_selected', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -903,7 +898,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('voice_selected', {
+    captureAnalyticsEvent('voice_selected', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -916,7 +911,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('voice_preview_played', {
+    captureAnalyticsEvent('voice_preview_played', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -928,7 +923,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('voice_pack_bound', {
+    captureAnalyticsEvent('voice_pack_bound', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -942,7 +937,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('attachment_uploaded', {
+    captureAnalyticsEvent('attachment_uploaded', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -951,7 +946,7 @@ export function useAnalytics() {
   function trackOfficialTtsExposed(properties: OfficialTtsBaseProperties) {
     if (!canCapture())
       return
-    posthog.capture('official_tts_exposed', {
+    captureAnalyticsEvent('official_tts_exposed', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -964,7 +959,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('preset_used', {
+    captureAnalyticsEvent('preset_used', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -978,7 +973,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('official_tts_preview_started', {
+    captureAnalyticsEvent('official_tts_preview_started', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -993,7 +988,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('official_tts_preview_succeeded', {
+    captureAnalyticsEvent('official_tts_preview_succeeded', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -1008,7 +1003,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('provider_switched', {
+    captureAnalyticsEvent('provider_switched', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -1022,7 +1017,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('settings_changed', {
+    captureAnalyticsEvent('settings_changed', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -1035,7 +1030,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('support_contacted', {
+    captureAnalyticsEvent('support_contacted', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -1047,7 +1042,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('official_tts_auto_enabled', {
+    captureAnalyticsEvent('official_tts_auto_enabled', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -1058,7 +1053,7 @@ export function useAnalytics() {
   function trackAutonomousGenerateText(properties: { model: string, reason?: string }) {
     if (!canCapture())
       return
-    posthog.capture('autonomous_generate_text', properties)
+    captureAnalyticsEvent('autonomous_generate_text', properties)
   }
 
   // ─── AIRI card (ccv3 character card) events ──────────────────────────
@@ -1071,7 +1066,7 @@ export function useAnalytics() {
   function trackCardEdited(properties: { card_id: string }) {
     if (!canCapture())
       return
-    posthog.capture('card_edited', {
+    captureAnalyticsEvent('card_edited', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -1081,7 +1076,7 @@ export function useAnalytics() {
   function trackSceneBackgroundSet(properties: { source: 'scene_settings' | 'card_gallery', cleared: boolean }) {
     if (!canCapture())
       return
-    posthog.capture('scene_background_set', {
+    captureAnalyticsEvent('scene_background_set', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -1090,7 +1085,7 @@ export function useAnalytics() {
   function trackCharacterUpdated(properties: { character_id: string }) {
     if (!canCapture())
       return
-    posthog.capture('character_updated', properties)
+    captureAnalyticsEvent('character_updated', properties)
   }
 
   // ─── App lifecycle ───────────────────────────────────────────────────
@@ -1098,7 +1093,7 @@ export function useAnalytics() {
   function trackAppLoaded(properties: { platform: 'web' | 'desktop' | 'mobile', version: string, cold_start_ms?: number }) {
     if (!canCapture())
       return
-    posthog.capture('app_loaded', properties)
+    captureAnalyticsEvent('app_loaded', properties)
   }
 
   // ─── Feature usage / retention ───────────────────────────────────────
@@ -1106,31 +1101,31 @@ export function useAnalytics() {
   function trackCharacterDeleted(properties: { character_id: string }) {
     if (!canCapture())
       return
-    posthog.capture('character_deleted', properties)
+    captureAnalyticsEvent('character_deleted', properties)
   }
 
   function trackCharacterSwitched(properties: { from_character_id?: string, to_character_id: string }) {
     if (!canCapture())
       return
-    posthog.capture('character_switched', properties)
+    captureAnalyticsEvent('character_switched', properties)
   }
 
   function trackChatSessionDeleted(properties: { session_id: string, message_count: number }) {
     if (!canCapture())
       return
-    posthog.capture('chat_session_deleted', properties)
+    captureAnalyticsEvent('chat_session_deleted', properties)
   }
 
   function trackOnboardingStepCompleted(step: string) {
     if (!canCapture())
       return
-    posthog.capture('onboarding_step_completed', { step })
+    captureAnalyticsEvent('onboarding_step_completed', { step })
   }
 
   function trackOnboardingSkipped(at_step: string) {
     if (!canCapture())
       return
-    posthog.capture('onboarding_skipped', { at_step })
+    captureAnalyticsEvent('onboarding_skipped', { at_step })
   }
 
   // ─── Monetization (client side) ──────────────────────────────────────
@@ -1138,13 +1133,13 @@ export function useAnalytics() {
   function trackFluxLowWarningShown(properties: { balance: number, threshold: number }) {
     if (!canCapture())
       return
-    posthog.capture('flux_low_warning_shown', properties)
+    captureAnalyticsEvent('flux_low_warning_shown', properties)
   }
 
   function trackFluxTopupClicked(properties: { balance: number, entry_surface: string }) {
     if (!canCapture())
       return
-    posthog.capture('flux_topup_clicked', properties)
+    captureAnalyticsEvent('flux_topup_clicked', properties)
   }
 
   function trackQuotaLimitReached(properties: {
@@ -1155,7 +1150,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('quota_limit_reached', properties)
+    captureAnalyticsEvent('quota_limit_reached', properties)
   }
 
   function trackUpgradeClicked(properties: {
@@ -1165,7 +1160,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('upgrade_clicked', properties)
+    captureAnalyticsEvent('upgrade_clicked', properties)
   }
 
   function trackFeatureUsed(properties: {
@@ -1176,7 +1171,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('feature_used', {
+    captureAnalyticsEvent('feature_used', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -1195,7 +1190,7 @@ export function useAnalytics() {
   }) {
     if (!canCapture())
       return
-    posthog.capture('data_action', {
+    captureAnalyticsEvent('data_action', {
       ...properties,
       app_surface: getConversationAnalyticsSurface(),
     })
@@ -1214,13 +1209,13 @@ export function useAnalytics() {
   function trackSpotlightUsed() {
     if (!canCapture())
       return
-    posthog.capture('spotlight_used')
+    captureAnalyticsEvent('spotlight_used', {})
   }
 
   function trackWidgetOpened(properties: { widget_id: string }) {
     if (!canCapture())
       return
-    posthog.capture('widget_opened', properties)
+    captureAnalyticsEvent('widget_opened', properties)
   }
 
   function trackUpdateCheckClicked(properties: { channel: string }) {
@@ -1230,7 +1225,7 @@ export function useAnalytics() {
   function trackUpdateDownloaded(properties: { channel: string, version?: string }) {
     if (!canCapture())
       return
-    posthog.capture('update_downloaded', properties)
+    captureAnalyticsEvent('update_downloaded', properties)
   }
 
   /** User confirmed restart-and-install; the app quits right after. */
@@ -1249,14 +1244,14 @@ export function useAnalytics() {
   function trackMcpConnectionTestRun(properties: { success: boolean }) {
     if (!canCapture())
       return
-    posthog.capture('mcp_connection_test_run', properties)
+    captureAnalyticsEvent('mcp_connection_test_run', properties)
   }
 
   /** Pairing QR revealed — the funnel start for `device_channel_connected`. */
   function trackDevicePairingQrShown() {
     if (!canCapture())
       return
-    posthog.capture('device_pairing_qr_shown')
+    captureAnalyticsEvent('device_pairing_qr_shown', {})
   }
 
   // ─── Voice clone (custom TTS voice) ──────────────────────────────────
@@ -1264,7 +1259,7 @@ export function useAnalytics() {
   function trackVoiceCloneCreated(properties: { provider: string }) {
     if (!canCapture())
       return
-    posthog.capture('voice_clone_created', properties)
+    captureAnalyticsEvent('voice_clone_created', properties)
   }
 
   // ─── Device pairing / channel (Electron / Tamagotchi) ─────────────────
@@ -1272,7 +1267,7 @@ export function useAnalytics() {
   function trackDeviceChannelConnected(properties: { channel: string }) {
     if (!canCapture())
       return
-    posthog.capture('device_channel_connected', properties)
+    captureAnalyticsEvent('device_channel_connected', properties)
   }
 
   return {
diff --git a/packages/stage-ui/src/libs/auth-fetch.test.ts b/packages/stage-ui/src/libs/auth-fetch.test.ts
index 0c70675cf..dd9abeb6a 100644
--- a/packages/stage-ui/src/libs/auth-fetch.test.ts
+++ b/packages/stage-ui/src/libs/auth-fetch.test.ts
@@ -7,7 +7,7 @@ const authMocks = vi.hoisted(() => ({
 }))
 
 const posthogMocks = vi.hoisted(() => ({
-  getPosthogIdentitySnapshot: vi.fn<() => { distinctId: string, sessionId: string } | null>(() => ({
+  getAnalyticsIdentitySnapshot: vi.fn<() => { distinctId: string, sessionId: string } | null>(() => ({
     distinctId: 'distinct-1',
     sessionId: 'session-1',
   })),
@@ -17,15 +17,15 @@ vi.mock('./auth', () => ({
   getAuthToken: authMocks.getAuthToken,
 }))
 
-vi.mock('../stores/analytics/posthog', () => ({
-  getPosthogIdentitySnapshot: posthogMocks.getPosthogIdentitySnapshot,
+vi.mock('../stores/analytics/client', () => ({
+  getAnalyticsIdentitySnapshot: posthogMocks.getAnalyticsIdentitySnapshot,
 }))
 
 describe('authedFetch', () => {
   beforeEach(() => {
     vi.restoreAllMocks()
     authMocks.getAuthToken.mockReturnValue('access-token')
-    posthogMocks.getPosthogIdentitySnapshot.mockReturnValue({
+    posthogMocks.getAnalyticsIdentitySnapshot.mockReturnValue({
       distinctId: 'distinct-1',
       sessionId: 'session-1',
     })
@@ -47,7 +47,7 @@ describe('authedFetch', () => {
   })
 
   it('omits PostHog identity headers when analytics has no active identity', async () => {
-    posthogMocks.getPosthogIdentitySnapshot.mockReturnValue(null)
+    posthogMocks.getAnalyticsIdentitySnapshot.mockReturnValue(null)
     const fetchMock = vi.fn<(input: RequestInfo | URL, init?: RequestInit) => Promise<Response>>(async () => new Response('{}', { status: 200 }))
     vi.stubGlobal('fetch', fetchMock)
 
diff --git a/packages/stage-ui/src/libs/auth-fetch.ts b/packages/stage-ui/src/libs/auth-fetch.ts
index 6fc1c14a7..ab5c3aa68 100644
--- a/packages/stage-ui/src/libs/auth-fetch.ts
+++ b/packages/stage-ui/src/libs/auth-fetch.ts
@@ -1,4 +1,4 @@
-import { getPosthogIdentitySnapshot } from '../stores/analytics/posthog'
+import { getAnalyticsIdentitySnapshot } from '../stores/analytics/client'
 import { useAuthStore } from '../stores/auth'
 import { getAuthToken } from './auth'
 import { SERVER_URL } from './server'
@@ -27,7 +27,7 @@ export async function authedFetch(
     const headers = new Headers(init?.headers)
     if (token)
       headers.set('Authorization', `Bearer ${token}`)
-    const posthogIdentity = shouldAttachPosthogIdentity(input) ? getPosthogIdentitySnapshot() : null
+    const posthogIdentity = shouldAttachPosthogIdentity(input) ? getAnalyticsIdentitySnapshot() : null
     if (posthogIdentity) {
       headers.set('x-posthog-distinct-id', posthogIdentity.distinctId)
       if (posthogIdentity.sessionId)
diff --git a/packages/stage-ui/src/stores/analytics/button-events.ts b/packages/stage-ui/src/stores/analytics/button-events.ts
index 461b8de2c..08d5573b8 100644
--- a/packages/stage-ui/src/stores/analytics/button-events.ts
+++ b/packages/stage-ui/src/stores/analytics/button-events.ts
@@ -1,9 +1,7 @@
-import posthog from 'posthog-js'
-
 import { isStageCapacitor, isStageTamagotchi } from '@proj-airi/stage-shared'
 
 import { useSettingsAnalytics } from '../settings/analytics'
-import { ensurePosthogInitialized, isPosthogAvailableInBuild } from './posthog'
+import { captureAnalyticsEvent, ensureAnalyticsInitialized, isAnalyticsAvailableInBuild } from './client'
 
 /** Stable, low-cardinality actions emitted by the Electron controls island. */
 export type ControlsIslandAction
@@ -52,9 +50,9 @@ export type TrackButtonEvent
 
 function canCapture(): boolean {
   const settingsAnalytics = useSettingsAnalytics()
-  return isPosthogAvailableInBuild()
+  return isAnalyticsAvailableInBuild()
     && settingsAnalytics.analyticsEnabled
-    && ensurePosthogInitialized(true)
+    && ensureAnalyticsInitialized(true)
 }
 
 function appSurface(): 'web' | 'mobile' | 'electron' {
@@ -84,27 +82,27 @@ export function captureTrackButtonEvent(event: TrackButtonEvent) {
         app_surface: appSurface(),
       }
       if (event.action === 'refresh_window' || event.action === 'close_app') {
-        posthog.capture(event.name, properties, { send_instantly: true, transport: 'sendBeacon' })
+        captureAnalyticsEvent(event.name, properties, { beforeNavigation: true })
         return
       }
 
-      posthog.capture(event.name, properties)
+      captureAnalyticsEvent(event.name, properties)
       return
     }
     case 'update_check_clicked':
-      posthog.capture(event.name, { channel: event.channel })
+      captureAnalyticsEvent(event.name, { channel: event.channel })
       return
     case 'update_install_clicked':
-      posthog.capture(
+      captureAnalyticsEvent(
         event.name,
         { channel: event.channel, ...(event.version && { version: event.version }) },
-        { send_instantly: true, transport: 'sendBeacon' },
+        { beforeNavigation: true },
       )
       return
     case 'mcp_server_added':
-      posthog.capture(event.name)
+      captureAnalyticsEvent(event.name, {})
       return
     case 'mcp_server_removed':
-      posthog.capture(event.name)
+      captureAnalyticsEvent(event.name, {})
   }
 }
diff --git a/packages/stage-ui/src/stores/analytics/client.test.ts b/packages/stage-ui/src/stores/analytics/client.test.ts
new file mode 100644
index 000000000..7431c0518
--- /dev/null
+++ b/packages/stage-ui/src/stores/analytics/client.test.ts
@@ -0,0 +1,56 @@
+import type { AnalyticsAdapter } from './client'
+
+import { describe, expect, it, vi } from 'vitest'
+
+import { AnalyticsClient } from './client'
+
+function createAdapter(): AnalyticsAdapter {
+  return {
+    capture: vi.fn(() => true),
+    getIdentitySnapshot: vi.fn(() => ({ distinctId: 'distinct-1', sessionId: 'session-1' })),
+    identify: vi.fn(),
+    registerBuildInfo: vi.fn(),
+    resetIdentity: vi.fn(),
+    setCaptureEnabled: vi.fn(enabled => enabled),
+  }
+}
+
+describe('analytics client', () => {
+  it('queues events while a provider adapter is loading and flushes them in order', async () => {
+    const adapter = createAdapter()
+    let install: ((adapter: AnalyticsAdapter) => void) | undefined
+    const client = new AnalyticsClient(() => new Promise<AnalyticsAdapter>((resolve) => {
+      install = resolve
+    }))
+
+    expect(client.ensureInitialized(true)).toBe(true)
+    expect(client.capture('app_loaded', { platform: 'web' })).toBe(true)
+    client.identify('user-1')
+    await Promise.resolve()
+    install?.(adapter)
+
+    await vi.waitFor(() => {
+      expect(adapter.capture).toHaveBeenCalledWith('app_loaded', { platform: 'web' }, undefined)
+    })
+    expect(adapter.identify).toHaveBeenCalledWith('user-1')
+  })
+
+  // ROOT CAUSE:
+  //
+  // A content blocker rejects the provider adapter's dynamic module request.
+  // If that rejection escapes into application startup, Vue never mounts.
+  //
+  // The client converts provider loading failure into a permanent no-op state.
+  it('fails open when a content blocker rejects the provider adapter', async () => {
+    const client = new AnalyticsClient(async () => {
+      throw new TypeError('Failed to fetch dynamically imported module')
+    })
+
+    expect(client.ensureInitialized(true)).toBe(true)
+    expect(client.capture('app_loaded', { platform: 'web' })).toBe(true)
+    await vi.waitFor(() => {
+      expect(client.capture('first_message_sent', {})).toBe(false)
+    })
+    expect(client.getIdentitySnapshot()).toBeNull()
+  })
+})
diff --git a/packages/stage-ui/src/stores/analytics/client.ts b/packages/stage-ui/src/stores/analytics/client.ts
new file mode 100644
index 000000000..01e4d4db8
--- /dev/null
+++ b/packages/stage-ui/src/stores/analytics/client.ts
@@ -0,0 +1,235 @@
+import type { AboutBuildInfo } from '../../components/scenarios/about/types'
+
+import { isEnvTruthy } from '@proj-airi/stage-shared'
+
+export interface AnalyticsIdentitySnapshot {
+  /** Current provider distinct id for the browser/device/user person. */
+  distinctId: string
+  /** Current provider session id, when one has been established. */
+  sessionId?: string
+}
+
+/** Provider-neutral delivery hints for one product event. */
+export interface AnalyticsCaptureOptions {
+  /**
+   * Indicates that document navigation immediately follows capture, allowing
+   * the adapter to select an unload-safe delivery mechanism.
+   * @default false
+   */
+  beforeNavigation?: boolean
+}
+
+/** Provider contract installed behind the shared analytics façade. */
+export interface AnalyticsAdapter {
+  capture: (name: string, properties: object, options?: AnalyticsCaptureOptions) => boolean
+  getIdentitySnapshot: () => AnalyticsIdentitySnapshot | null
+  identify: (userId: string) => void
+  registerBuildInfo: (buildInfo: AboutBuildInfo) => void
+  resetIdentity: () => void
+  setCaptureEnabled: (enabled: boolean) => boolean
+}
+
+/** Initialization state supplied to an analytics adapter loader. */
+export interface AnalyticsAdapterOptions {
+  /** Whether capture is enabled when the adapter initializes. */
+  enabled: boolean
+}
+
+/** Loads one provider adapter. Rejections permanently degrade the client to no-op. */
+export type AnalyticsAdapterLoader = (options: AnalyticsAdapterOptions) => Promise<AnalyticsAdapter>
+
+type PendingOperation
+  = | { kind: 'capture', name: string, properties: object, options?: AnalyticsCaptureOptions }
+    | { kind: 'identify', userId: string }
+    | { kind: 'register-build-info', buildInfo: AboutBuildInfo }
+    | { kind: 'reset-identity' }
+    | { kind: 'set-capture-enabled', enabled: boolean }
+
+type LoadState = 'idle' | 'loading' | 'ready' | 'unavailable'
+
+/**
+ * Owns an optional provider's lifecycle and keeps provider loading out of the
+ * static application graph. Calls made while loading use a bounded queue.
+ */
+export class AnalyticsClient {
+  private adapter: AnalyticsAdapter | undefined
+  private captureEnabled = false
+  private loadPromise: Promise<boolean> | undefined
+  private loadState: LoadState = 'idle'
+  private readonly pendingOperations: PendingOperation[] = []
+
+  constructor(private readonly loader: AnalyticsAdapterLoader) {}
+
+  ensureInitialized(enabled: boolean): boolean {
+    this.captureEnabled = enabled
+    if (!enabled || this.loadState === 'unavailable')
+      return false
+
+    if (this.loadState === 'idle')
+      void this.load(enabled)
+
+    return true
+  }
+
+  syncCapture(enabled: boolean): boolean {
+    this.captureEnabled = enabled
+    if (enabled)
+      return this.ensureInitialized(true)
+
+    if (this.adapter)
+      this.adapter.setCaptureEnabled(false)
+    else if (this.loadState === 'loading')
+      this.enqueue({ kind: 'set-capture-enabled', enabled: false })
+
+    return false
+  }
+
+  registerBuildInfo(buildInfo: AboutBuildInfo): void {
+    if (this.adapter)
+      this.adapter.registerBuildInfo(buildInfo)
+    else if (this.loadState === 'loading')
+      this.enqueue({ kind: 'register-build-info', buildInfo })
+  }
+
+  identify(userId: string): void {
+    if (this.adapter)
+      this.adapter.identify(userId)
+    else if (this.loadState === 'loading')
+      this.enqueue({ kind: 'identify', userId })
+  }
+
+  resetIdentity(): void {
+    if (this.adapter)
+      this.adapter.resetIdentity()
+    else if (this.loadState === 'loading')
+      this.enqueue({ kind: 'reset-identity' })
+  }
+
+  getIdentitySnapshot(): AnalyticsIdentitySnapshot | null {
+    return this.adapter?.getIdentitySnapshot() ?? null
+  }
+
+  capture(name: string, properties: object, options?: AnalyticsCaptureOptions): boolean {
+    if (!this.captureEnabled)
+      return false
+
+    if (this.adapter)
+      return this.adapter.capture(name, properties, options)
+
+    if (this.loadState === 'loading') {
+      this.enqueue({ kind: 'capture', name, properties, options })
+      return true
+    }
+
+    return false
+  }
+
+  private load(enabled: boolean): Promise<boolean> {
+    if (this.loadPromise)
+      return this.loadPromise
+
+    this.loadState = 'loading'
+    this.loadPromise = Promise.resolve()
+      .then(() => this.loader({ enabled }))
+      .then((adapter) => {
+        this.adapter = adapter
+        this.loadState = 'ready'
+        this.flush()
+        return true
+      })
+      .catch(() => {
+        // A denied dynamic module request is expected under content blockers.
+        // Product events are optional, so core application work stays no-op.
+        this.pendingOperations.length = 0
+        this.loadState = 'unavailable'
+        return false
+      })
+
+    return this.loadPromise
+  }
+
+  private enqueue(operation: PendingOperation): void {
+    // Keep the latest events without letting a slow provider grow memory for
+    // the lifetime of a long-running desktop session.
+    if (this.pendingOperations.length === 100)
+      this.pendingOperations.shift()
+    this.pendingOperations.push(operation)
+  }
+
+  private flush(): void {
+    if (!this.adapter)
+      return
+
+    for (const operation of this.pendingOperations) {
+      switch (operation.kind) {
+        case 'capture':
+          this.adapter.capture(operation.name, operation.properties, operation.options)
+          break
+        case 'identify':
+          this.adapter.identify(operation.userId)
+          break
+        case 'register-build-info':
+          this.adapter.registerBuildInfo(operation.buildInfo)
+          break
+        case 'reset-identity':
+          this.adapter.resetIdentity()
+          break
+        case 'set-capture-enabled':
+          this.adapter.setCaptureEnabled(operation.enabled)
+      }
+    }
+    this.pendingOperations.length = 0
+  }
+}
+
+let adapterLoader: AnalyticsAdapterLoader | undefined
+const analytics = new AnalyticsClient(async (options) => {
+  if (!adapterLoader)
+    throw new Error('No analytics adapter has been configured')
+  return adapterLoader(options)
+})
+
+/** Configures the provider loader before the shared store initializes. */
+export function configureAnalyticsAdapter(loader: AnalyticsAdapterLoader): void {
+  adapterLoader = loader
+}
+
+export function isAnalyticsAvailableInBuild(): boolean {
+  return isEnvTruthy(import.meta.env.VITE_ENABLE_POSTHOG)
+}
+
+export function ensureAnalyticsInitialized(enabled: boolean): boolean {
+  if (!isAnalyticsAvailableInBuild() || !adapterLoader)
+    return false
+  return analytics.ensureInitialized(enabled)
+}
+
+export function syncAnalyticsCapture(enabled: boolean): boolean {
+  if (!isAnalyticsAvailableInBuild() || !adapterLoader)
+    return false
+  return analytics.syncCapture(enabled)
+}
+
+export function registerAnalyticsBuildInfo(buildInfo: AboutBuildInfo): void {
+  analytics.registerBuildInfo(buildInfo)
+}
+
+export function identifyAnalyticsUser(userId: string): void {
+  analytics.identify(userId)
+}
+
+export function resetAnalyticsIdentity(): void {
+  analytics.resetIdentity()
+}
+
+export function getAnalyticsIdentitySnapshot(): AnalyticsIdentitySnapshot | null {
+  return analytics.getIdentitySnapshot()
+}
+
+/**
+ * Emits an event through the configured provider. Returns `false` when capture
+ * is disabled or the provider is unavailable, allowing callers to gate dedup.
+ */
+export function captureAnalyticsEvent(name: string, properties: object, options?: AnalyticsCaptureOptions): boolean {
+  return analytics.capture(name, properties, options)
+}
diff --git a/packages/stage-ui/src/stores/analytics/index.ts b/packages/stage-ui/src/stores/analytics/index.ts
index 8e785617d..4d23eccfc 100644
--- a/packages/stage-ui/src/stores/analytics/index.ts
+++ b/packages/stage-ui/src/stores/analytics/index.ts
@@ -10,15 +10,15 @@ import { useAiriCardStore } from '../modules/airi-card'
 import { useConsciousnessStore } from '../modules/consciousness'
 import { useSettingsAnalytics } from '../settings/analytics'
 import {
-  capturePosthogEvent,
-  identifyPosthogUser,
-  isPosthogAvailableInBuild,
-  registerPosthogBuildInfo,
-  resetPosthog,
-  syncPosthogCapture,
-} from './posthog'
+  captureAnalyticsEvent,
+  identifyAnalyticsUser,
+  isAnalyticsAvailableInBuild,
+  registerAnalyticsBuildInfo,
+  resetAnalyticsIdentity,
+  syncAnalyticsCapture,
+} from './client'
 
-export * from './posthog'
+export * from './client'
 export * from './privacy-policy'
 
 function analyticsSurface(): 'web' | 'desktop' | 'mobile' {
@@ -45,8 +45,7 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
   const firstMessageTracked = ref(false)
   // In-memory only, intentionally — matches `firstMessageTracked` semantics
   // (resets on reload). PostHog can compute true "first time across all
-  // sessions" with `posthog.capture('first_*', ..., { send_instantly: true })`
-  // + person-level dedup at query time.
+  // sessions" with provider-side person-level dedup at query time.
   const firstModelSelectedTracked = ref(false)
 
   watch(analyticsEnabled, (enabled, previousEnabled) => {
@@ -54,7 +53,7 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
       return
 
     if (previousEnabled && !enabled) {
-      capturePosthogEvent('settings_changed', {
+      captureAnalyticsEvent('settings_changed', {
         setting_name: 'analytics_enabled',
         previous_value: previousEnabled,
         new_value: enabled,
@@ -63,10 +62,10 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
       })
     }
 
-    const shouldCapture = syncPosthogCapture(enabled)
+    const shouldCapture = syncAnalyticsCapture(enabled)
     if (shouldCapture) {
       if (!previousEnabled && enabled) {
-        capturePosthogEvent('settings_changed', {
+        captureAnalyticsEvent('settings_changed', {
           setting_name: 'analytics_enabled',
           previous_value: previousEnabled,
           new_value: enabled,
@@ -83,7 +82,7 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
         markFirstMessageTracked()
       }
 
-      registerPosthogBuildInfo(buildInfo.value)
+      registerAnalyticsBuildInfo(buildInfo.value)
       // If a user enabled analytics mid-session while already authenticated,
       // identify them now — `initialize()`'s identify only fires once at
       // app startup and at auth-state changes, neither of which trigger
@@ -92,7 +91,7 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
       // anonymous funnel events.
       const authStore = useAuthStore()
       if (authStore.isAuthenticated && authStore.user?.id)
-        identifyPosthogUser(authStore.user.id)
+        identifyAnalyticsUser(authStore.user.id)
     }
   })
 
@@ -102,12 +101,12 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
 
     appStartTime.value = Date.now()
 
-    if (isPosthogAvailableInBuild()) {
-      const shouldCapture = syncPosthogCapture(analyticsEnabled.value)
+    if (isAnalyticsAvailableInBuild()) {
+      const shouldCapture = syncAnalyticsCapture(analyticsEnabled.value)
       if (shouldCapture) {
-        registerPosthogBuildInfo(buildInfo.value)
+        registerAnalyticsBuildInfo(buildInfo.value)
         const platform = analyticsSurface()
-        capturePosthogEvent('app_loaded', {
+        captureAnalyticsEvent('app_loaded', {
           platform,
           version: buildInfo.value.version,
         })
@@ -121,14 +120,14 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
     // `apps/server/docs/ai-context/metrics-ownership.md`.
     const authStore = useAuthStore()
     if (authStore.isAuthenticated && authStore.user?.id)
-      identifyPosthogUser(authStore.user.id)
+      identifyAnalyticsUser(authStore.user.id)
 
     authStore.onAuthenticated(() => {
       if (authStore.user?.id)
-        identifyPosthogUser(authStore.user.id)
+        identifyAnalyticsUser(authStore.user.id)
     })
     authStore.onLogout(() => {
-      resetPosthog()
+      resetAnalyticsIdentity()
     })
 
     // Wire model-selection events. The consciousness store holds the
@@ -160,7 +159,7 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
             // when the capture actually went out (PostHog initialised + user
             // not opted out); otherwise an early opt-in or delayed init
             // would never get the chance to emit `first_model_selected`.
-            const captured = capturePosthogEvent('first_model_selected', { model_id: next.model, provider: next.provider })
+            const captured = captureAnalyticsEvent('first_model_selected', { model_id: next.model, provider: next.provider })
             if (captured)
               firstModelSelectedTracked.value = true
           }
@@ -173,7 +172,7 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
         if (!firstModelSelectedTracked.value) {
           // Same gating as the baseline branch: only mark first-selection
           // as tracked when capture actually shipped.
-          const captured = capturePosthogEvent('first_model_selected', { model_id: next.model, provider: next.provider })
+          const captured = captureAnalyticsEvent('first_model_selected', { model_id: next.model, provider: next.provider })
           if (captured)
             firstModelSelectedTracked.value = true
           return
@@ -183,7 +182,7 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
         // Provider transitions without a prior model (e.g. user clears then
         // re-selects) skip the switch event; the next clean A → B will fire.
         if (prev.provider && prev.provider !== next.provider) {
-          capturePosthogEvent('provider_switched', {
+          captureAnalyticsEvent('provider_switched', {
             from_provider: prev.provider,
             to_provider: next.provider,
             from_provider_type: providerMode(prev.provider),
@@ -194,12 +193,12 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
         }
 
         if (prev.model) {
-          capturePosthogEvent('model_switched', {
+          captureAnalyticsEvent('model_switched', {
             from_model: prev.model,
             to_model: next.model,
             reason: 'manual',
           })
-          capturePosthogEvent('model_changed', {
+          captureAnalyticsEvent('model_changed', {
             from_model: prev.model,
             to_model: next.model,
             provider: next.provider,
@@ -222,7 +221,7 @@ export const useSharedAnalyticsStore = defineStore('analytics-shared', () => {
         // not a switch — skip emit; the first real A→B will fire.
         if (!next || !prev || prev === next)
           return
-        capturePosthogEvent('character_switched', {
+        captureAnalyticsEvent('character_switched', {
           from_character_id: prev,
           to_character_id: next,
         })
diff --git a/packages/stage-ui/src/stores/analytics/posthog.test.ts b/packages/stage-ui/src/stores/analytics/posthog.test.ts
index b58c467e3..f9af3fe26 100644
--- a/packages/stage-ui/src/stores/analytics/posthog.test.ts
+++ b/packages/stage-ui/src/stores/analytics/posthog.test.ts
@@ -1,8 +1,9 @@
 import { describe, expect, it, vi } from 'vitest'
 
-import { ensurePosthogInitialized, getPosthogIdentitySnapshot } from './posthog'
+import { createPosthogAdapter } from './posthog'
 
 const posthogMocks = vi.hoisted(() => ({
+  capture: vi.fn(),
   get_distinct_id: vi.fn(() => 'distinct-1'),
   get_session_id: vi.fn(() => 'session-1'),
   has_opted_out_capturing: vi.fn(() => false),
@@ -10,9 +11,7 @@ const posthogMocks = vi.hoisted(() => ({
   register: vi.fn(),
 }))
 
-vi.mock('posthog-js', () => ({
-  default: posthogMocks,
-}))
+vi.mock('posthog-js', () => ({ default: posthogMocks }))
 
 vi.mock('@proj-airi/stage-shared', () => ({
   isStageCapacitor: () => false,
@@ -21,27 +20,38 @@ vi.mock('@proj-airi/stage-shared', () => ({
 
 vi.mock('../../../../../posthog.config', () => ({
   DEFAULT_POSTHOG_CONFIG: {},
-  POSTHOG_ENABLED: true,
   POSTHOG_PROJECT_KEY: 'test-project-key',
 }))
 
-describe('stage PostHog initialization', () => {
+describe('posthog analytics adapter', () => {
   // ROOT CAUSE:
   //
   // `surface` was registered as the runtime platform but individual events
   // also used `surface` for entry points such as `settings_flux`. Event
   // properties overwrite super properties, so platform breakdowns drifted.
   it('registers the runtime under the dedicated app_surface property', () => {
-    expect(ensurePosthogInitialized(true)).toBe(true)
+    createPosthogAdapter({ enabled: true })
     expect(posthogMocks.register).toHaveBeenCalledWith({ app_surface: 'web' })
   })
 
-  it('exposes the current PostHog identity for server-side conversion linking', () => {
-    expect(ensurePosthogInitialized(true)).toBe(true)
+  it('exposes the current provider identity for server-side conversion linking', () => {
+    const adapter = createPosthogAdapter({ enabled: true })
 
-    expect(getPosthogIdentitySnapshot()).toEqual({
+    expect(adapter.getIdentitySnapshot()).toEqual({
       distinctId: 'distinct-1',
       sessionId: 'session-1',
     })
   })
+
+  it('maps the provider-neutral navigation hint to unload-safe delivery', () => {
+    const adapter = createPosthogAdapter({ enabled: true })
+
+    adapter.capture('checkout_started', { plan_id: 'monthly' }, { beforeNavigation: true })
+
+    expect(posthogMocks.capture).toHaveBeenCalledWith(
+      'checkout_started',
+      { plan_id: 'monthly' },
+      { send_instantly: true, transport: 'sendBeacon' },
+    )
+  })
 })
diff --git a/packages/stage-ui/src/stores/analytics/posthog.ts b/packages/stage-ui/src/stores/analytics/posthog.ts
index 4f1186e5a..9e82aa62b 100644
--- a/packages/stage-ui/src/stores/analytics/posthog.ts
+++ b/packages/stage-ui/src/stores/analytics/posthog.ts
@@ -1,4 +1,5 @@
 import type { AboutBuildInfo } from '../../components/scenarios/about/types'
+import type { AnalyticsAdapter, AnalyticsAdapterOptions } from './client'
 
 import posthog from 'posthog-js'
 
@@ -6,158 +7,74 @@ import { isStageCapacitor, isStageTamagotchi } from '@proj-airi/stage-shared'
 
 import {
   DEFAULT_POSTHOG_CONFIG,
-  POSTHOG_ENABLED,
   POSTHOG_PROJECT_KEY,
 } from '../../../../../posthog.config'
 
-let posthogInitialized = false
-
-export interface PosthogIdentitySnapshot {
-  /** Current PostHog distinct id for the browser/device/user person. */
-  distinctId: string
-  /** Current PostHog session id, when the SDK has established one. */
-  sessionId?: string
-}
-
-// All AIRI surfaces (web, desktop, mobile) capture into a single PostHog
-// project. The platform is carried on every event via the `app_surface` super
-// property (registered at init), so cross-platform funnels live in one
-// project instead of being split across per-platform projects.
 function currentSurface(): 'web' | 'mobile' | 'electron' {
   if (isStageTamagotchi())
     return 'electron'
-
   if (isStageCapacitor())
     return 'mobile'
-
   return 'web'
 }
 
-export function isPosthogAvailableInBuild(): boolean {
-  return POSTHOG_ENABLED
-}
-
-export function ensurePosthogInitialized(enabled: boolean): boolean {
-  if (!POSTHOG_ENABLED)
-    return false
-
-  if (posthogInitialized)
-    return true
-
+/** Creates and initializes the default PostHog analytics adapter. */
+export function createPosthogAdapter(options: AnalyticsAdapterOptions): AnalyticsAdapter {
   posthog.init(POSTHOG_PROJECT_KEY, {
     ...DEFAULT_POSTHOG_CONFIG,
-    opt_out_capturing_by_default: !enabled,
+    opt_out_capturing_by_default: !options.enabled,
   })
-  // Tag every event (including autocapture / pageview) with the platform so
-  // the single project can still be broken down by web / desktop / mobile.
   posthog.register({ app_surface: currentSurface() })
-  posthogInitialized = true
-  return true
-}
 
-export function syncPosthogCapture(enabled: boolean): boolean {
-  if (!POSTHOG_ENABLED)
-    return false
-
-  if (enabled) {
-    ensurePosthogInitialized(true)
-
-    if (posthog.has_opted_out_capturing())
-      posthog.opt_in_capturing()
-
-    return true
-  }
-
-  if (posthogInitialized && !posthog.has_opted_out_capturing())
-    posthog.opt_out_capturing()
-
-  return false
-}
-
-export function registerPosthogBuildInfo(buildInfo: AboutBuildInfo): void {
-  if (!posthogInitialized)
-    return
-
-  posthog.register({
-    app_version: (buildInfo.version && buildInfo.version !== '0.0.0') ? buildInfo.version : 'dev',
-    app_commit: buildInfo.commit,
-    app_branch: buildInfo.branch,
-    app_build_time: buildInfo.builtOn,
-  })
-}
-
-/**
- * Identify the current user on PostHog so server-side `payment_completed` /
- * `subscription_cancelled` events (which use the Better Auth user id as
- * `distinctId`) merge with the same person profile as the browser's
- * anonymous funnel start events. Without this call the funnel is broken
- * end-to-end: server events land on the user-id person, browser events
- * land on the anonymous device person, PostHog cannot join them.
- *
- * Expects:
- * - `userId` is the Better Auth user id (`user.id`) — the same value the
- *   server-side product-events forwarder passes as `distinctId` (see
- *   `apps/server/src/services/domain/product-events.ts`).
- */
-export function identifyPosthogUser(userId: string): void {
-  if (!posthogInitialized || posthog.has_opted_out_capturing())
-    return
-  // PostHog's `identify` is idempotent and aliases the anonymous distinct
-  // id, so calling it on every auth-state-change is safe.
-  posthog.identify(userId)
-}
-
-/**
- * Reset PostHog's distinct id on logout so subsequent activity from this
- * device is treated as a new anonymous user (not attributed to the prior
- * logged-in user, which would corrupt cohort analysis if a second user
- * signs in on the same device).
- */
-export function resetPosthog(): void {
-  if (!posthogInitialized)
-    return
-  posthog.reset()
-}
-
-/**
- * Returns the current PostHog identity that server-side conversion events can
- * use to merge Stripe webhook facts back into the same browser funnel.
- */
-export function getPosthogIdentitySnapshot(): PosthogIdentitySnapshot | null {
-  if (!posthogInitialized || posthog.has_opted_out_capturing())
-    return null
-
-  const distinctId = posthog.get_distinct_id()
-  if (!distinctId)
-    return null
-
-  const sessionId = posthog.get_session_id()
   return {
-    distinctId,
-    ...(sessionId && { sessionId }),
+    capture(name, properties, captureOptions) {
+      if (posthog.has_opted_out_capturing())
+        return false
+      posthog.capture(
+        name,
+        { ...properties },
+        captureOptions?.beforeNavigation
+          ? { send_instantly: true, transport: 'sendBeacon' }
+          : undefined,
+      )
+      return true
+    },
+    getIdentitySnapshot() {
+      if (posthog.has_opted_out_capturing())
+        return null
+
+      const distinctId = posthog.get_distinct_id()
+      if (!distinctId)
+        return null
+
+      const sessionId = posthog.get_session_id()
+      return { distinctId, ...(sessionId && { sessionId }) }
+    },
+    identify(userId) {
+      if (!posthog.has_opted_out_capturing())
+        posthog.identify(userId)
+    },
+    registerBuildInfo(buildInfo: AboutBuildInfo) {
+      posthog.register({
+        app_version: (buildInfo.version && buildInfo.version !== '0.0.0') ? buildInfo.version : 'dev',
+        app_commit: buildInfo.commit,
+        app_branch: buildInfo.branch,
+        app_build_time: buildInfo.builtOn,
+      })
+    },
+    resetIdentity() {
+      posthog.reset()
+    },
+    setCaptureEnabled(enabled) {
+      if (enabled) {
+        if (posthog.has_opted_out_capturing())
+          posthog.opt_in_capturing()
+        return true
+      }
+
+      if (!posthog.has_opted_out_capturing())
+        posthog.opt_out_capturing()
+      return false
+    },
   }
 }
-
-interface PosthogCaptureOptions {
-  send_instantly?: boolean
-  transport?: 'XHR' | 'fetch' | 'sendBeacon'
-}
-
-/**
- * Single source-of-truth wrapper for emitting events from store-layer code
- * (places that can't pull `useAnalytics()` without creating circular
- * `analytics-store → use-analytics composable → analytics-store` graphs).
- * Returns `false` when capture was skipped so callers can gate dedup flags.
- *
- * Use when:
- * - You're inside a pinia store / Vue watcher that needs to fire a PostHog
- *   event. UI components should still prefer `useAnalytics()` composable
- *   for consistency with existing call sites.
- */
-export function capturePosthogEvent(name: string, properties: Record<string, unknown>, options?: PosthogCaptureOptions): boolean {
-  if (!posthogInitialized || posthog.has_opted_out_capturing())
-    return false
-
-  posthog.capture(name, properties, options)
-  return true
-}
diff --git a/packages/stage-ui/src/stores/chat/session-store.ts b/packages/stage-ui/src/stores/chat/session-store.ts
index df751c7fe..975b9e501 100644
--- a/packages/stage-ui/src/stores/chat/session-store.ts
+++ b/packages/stage-ui/src/stores/chat/session-store.ts
@@ -23,7 +23,7 @@ import {
   reconcileLocalAndRemote,
 } from '../../libs/chat-sync'
 import { SERVER_URL } from '../../libs/server'
-import { capturePosthogEvent } from '../analytics/posthog'
+import { captureAnalyticsEvent } from '../analytics/client'
 import { useAuthStore } from '../auth'
 import { useAiriCardStore } from '../modules/airi-card'
 import { mergeLoadedSessionMessages } from './session-message-merge'
@@ -441,7 +441,7 @@ export const useChatSessionStore = defineStore('chat-session', () => {
     if (options?.setActive !== false)
       activeSessionId.value = sessionId
 
-    capturePosthogEvent('conversation_created', {
+    captureAnalyticsEvent('conversation_created', {
       conversation_id: sessionId,
       source: options?.messages?.length ? 'fork' : 'new_session',
       character_id: characterId,
@@ -485,11 +485,11 @@ export const useChatSessionStore = defineStore('chat-session', () => {
 
     // Snapshot count before the in-memory wipe below zeroes it out.
     const messageCount = (sessionMessages.value[sessionId] ?? []).length
-    capturePosthogEvent('chat_session_deleted', {
+    captureAnalyticsEvent('chat_session_deleted', {
       session_id: sessionId,
       message_count: messageCount,
     })
-    capturePosthogEvent('conversation_deleted', {
+    captureAnalyticsEvent('conversation_deleted', {
       conversation_id: sessionId,
       message_count: messageCount,
       cloud_synced: !!meta.cloudChatId,
diff --git a/packages/stage-ui/src/stores/exports.contract.test.ts b/packages/stage-ui/src/stores/exports.contract.test.ts
deleted file mode 100644
index a7d112204..000000000
--- a/packages/stage-ui/src/stores/exports.contract.test.ts
+++ /dev/null
@@ -1,73 +0,0 @@
-import { readFileSync } from 'node:fs'
-import { dirname, resolve } from 'node:path'
-import { fileURLToPath } from 'node:url'
-
-import { describe, expect, it } from 'vitest'
-
-const currentFilePath = fileURLToPath(import.meta.url)
-const currentDirectory = dirname(currentFilePath)
-const packageJsonPath = resolve(currentDirectory, '../../package.json')
-
-function readExports() {
-  const packageJson = JSON.parse(readFileSync(packageJsonPath, 'utf8')) as {
-    exports: Record<string, string>
-  }
-  return packageJson.exports
-}
-
-describe('stage-ui exports contract', () => {
-  it('keeps the exported subpath key set stable', () => {
-    const exportsMap = readExports()
-
-    expect(Object.keys(exportsMap).sort()).toEqual([
-      '.',
-      './components',
-      './components/*',
-      './components/scenarios/chat',
-      './components/scenarios/settings/model-settings',
-      './components/scenes',
-      './composables',
-      './composables/*',
-      './constants',
-      './constants/*',
-      './directives/*',
-      './libs',
-      './libs/*',
-      './libs/inference',
-      './libs/inference/adapters/*',
-      './services/*',
-      './stores',
-      './stores/*',
-      './stores/analytics',
-      './stores/analytics/posthog',
-      './stores/analytics/privacy-policy',
-      './stores/character',
-      './stores/character/orchestrator/spark-notify-agent',
-      './stores/mcp-tool-bridge',
-      './stores/modules/vision',
-      './stores/providers/aliyun',
-      './stores/settings',
-      './stores/settings/analytics',
-      './tools/mcp',
-      './types',
-      './types/*',
-      './utils',
-      './utils/tts',
-      './workers',
-      './workers/*',
-      './workers/vad',
-    ])
-  })
-
-  it('keeps critical store and type mappings unchanged', () => {
-    const exportsMap = readExports()
-
-    expect(exportsMap['./stores']).toBe('./src/stores/index.ts')
-    expect(exportsMap['./stores/*']).toBe('./src/stores/*.ts')
-    expect(exportsMap['./directives/*']).toBe('./src/directives/*.ts')
-    expect(exportsMap['./services/*']).toBe('./src/services/*.ts')
-    expect(exportsMap['./tools/mcp']).toBe('./src/tools/mcp.ts')
-    expect(exportsMap['./types']).toBe('./src/types/index.ts')
-    expect(exportsMap['./types/*']).toBe('./src/types/*.ts')
-  })
-})
diff --git a/packages/stage-ui/src/stores/modules/airi-card.ts b/packages/stage-ui/src/stores/modules/airi-card.ts
index ee3455816..5ff926a3b 100644
--- a/packages/stage-ui/src/stores/modules/airi-card.ts
+++ b/packages/stage-ui/src/stores/modules/airi-card.ts
@@ -11,7 +11,7 @@ import { useI18n } from 'vue-i18n'
 import SystemPromptV2 from '../../constants/prompts/system-v2'
 
 import { DEFAULT_ARTISTRY_WIDGET_SPAWNING_PROMPT } from '../../constants/prompts/character-defaults'
-import { capturePosthogEvent } from '../analytics/posthog'
+import { captureAnalyticsEvent } from '../analytics/client'
 import { useSettingsStageModel } from '../settings/stage-model'
 import { useArtistryStore } from './artistry'
 import { useConsciousnessStore } from './consciousness'
@@ -76,7 +76,7 @@ export const useAiriCardStore = defineStore('airi-card', () => {
   const addCard = (card: AiriCard | Card | ccv3.CharacterCardV3, source: 'scratch' | 'import' | 'duplicate') => {
     const newCardId = nanoid()
     cards.value.set(newCardId, newAiriCard(card))
-    capturePosthogEvent('card_created', { card_id: newCardId, source })
+    captureAnalyticsEvent('card_created', { card_id: newCardId, source })
     return newCardId
   }
 
@@ -94,7 +94,7 @@ export const useAiriCardStore = defineStore('airi-card', () => {
     if (activeCardId.value === id)
       activeCardId.value = 'default'
 
-    capturePosthogEvent('character_deleted', { character_id: id })
+    captureAnalyticsEvent('character_deleted', { character_id: id })
     return true
   }
 
diff --git a/packages/stage-ui/src/stores/providers.ts b/packages/stage-ui/src/stores/providers.ts
index 2704efcd1..046215f07 100644
--- a/packages/stage-ui/src/stores/providers.ts
+++ b/packages/stage-ui/src/stores/providers.ts
@@ -55,7 +55,7 @@ import { getKokoroAdapter } from '../libs/inference/adapters/kokoro'
 import { getProviderValidationIntervalMs, listProviders as listDefinedProviders, ProviderValidationCheck } from '../libs/providers'
 import { resolveProviderSourceMetadata } from '../libs/providers/source-metadata'
 import { getDefaultKokoroModel, KOKORO_MODELS, kokoroModelsToModelInfo } from '../workers/kokoro/constants'
-import { capturePosthogEvent, ensurePosthogInitialized, isPosthogAvailableInBuild } from './analytics/posthog'
+import { captureAnalyticsEvent, ensureAnalyticsInitialized, isAnalyticsAvailableInBuild } from './analytics/client'
 import { useAuthStore } from './auth'
 import { createAliyunNLSProvider as createAliyunNlsStreamProvider } from './providers/aliyun/stream-transcription'
 import { convertProviderDefinitionsToMetadata } from './providers/converters'
@@ -108,14 +108,14 @@ function analyticsSurface(): 'web' | 'mobile' | 'electron' {
  * Checks analytics settings and initializes PostHog without loading build metadata.
  */
 function canCaptureProviderAnalytics(): boolean {
-  if (!isPosthogAvailableInBuild())
+  if (!isAnalyticsAvailableInBuild())
     return false
 
   const settingsAnalytics = useSettingsAnalytics()
   if (!settingsAnalytics.analyticsEnabled)
     return false
 
-  return ensurePosthogInitialized(true)
+  return ensureAnalyticsInitialized(true)
 }
 
 /**
@@ -130,7 +130,7 @@ function trackModelListLoaded(properties: {
   if (!canCaptureProviderAnalytics())
     return
 
-  capturePosthogEvent('model_list_loaded', {
+  captureAnalyticsEvent('model_list_loaded', {
     ...properties,
     app_surface: analyticsSurface(),
   })
@@ -148,7 +148,7 @@ function trackModelListFailed(properties: {
   if (!canCaptureProviderAnalytics())
     return
 
-  capturePosthogEvent('model_list_failed', {
+  captureAnalyticsEvent('model_list_failed', {
     ...properties,
     app_surface: analyticsSurface(),
   })