diff --git a/AGENTS.md b/AGENTS.md
index a12c97841..f339c0756 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -100,7 +100,8 @@ Concise but detailed reference for contributors working across the `moeru-ai/air
 - Prefer Vue v-bind class arrays for readability when working with UnoCSS & tailwindcss: do `:class="['px-2 py-1','flex items-center','bg-white/50 dark:bg-black/50']"`, don't do `class="px-2 py-1 flex items-center bg-white/50 dark:bg-black/50"`, don't do `px="2" py="1" flex="~ items-center" bg="white/50 dark:black/50"`; avoid long inline `class=""`. Refactor legacy when you touch it.
 - Use/extend UnoCSS shortcuts/rules in `uno.config.ts`; add new shortcuts/rules/plugins there when standardizing styles. Prefer UnoCSS over Tailwind.
 - Check `apps/stage-web/src/styles` for existing animations; reuse or extend before adding new ones. If you need config references, see `apps/stage-web/tsconfig.json` and `uno.config.ts`.
-- Build primitives on `@proj-airi/ui` (reka-ui) instead of raw DOM; see `packages/ui/src/components/Form` for patterns.
+- Build primitives on `@proj-airi/ui` (reka-ui) instead of raw DOM; see [`docs/ai/context/ui-components.md`](docs/ai/context/ui-components.md) for the full component API reference and `packages/ui/src/components/Form` for implementation patterns.
+- **When adding or updating components in `packages/ui`**, update [`docs/ai/context/ui-components.md`](docs/ai/context/ui-components.md) to reflect the change (props, slots, emits, description).
 - Use Iconify icon sets; avoid bespoke SVGs.
 - Animations: keep intuitive, lively, and readable.
 - `useDark` (VueUse): set `disableTransition: false` or use existing composables in `packages/ui`.
diff --git a/docs/ai/context/ui-components.md b/docs/ai/context/ui-components.md
new file mode 100644
index 000000000..1e28f627f
--- /dev/null
+++ b/docs/ai/context/ui-components.md
@@ -0,0 +1,551 @@
+# `@proj-airi/ui` Component Reference
+
+> **Auto-maintained**: When adding or updating components in `packages/ui`, update this document accordingly.
+
+Standardized primitives built on [reka-ui](https://reka-ui.com/). Minimal business logic — use these instead of raw DOM elements.
+
+Source: `packages/ui/src/components/`
+
+---
+
+## Animations
+
+### TransitionBidirectional
+
+Bidirectional Vue `<Transition>` wrapper with customizable CSS classes.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `fromClass` | `string?` | — | CSS class for initial state |
+| `activeClass` | `string?` | — | CSS class during transition |
+| `toClass` | `string?` | — | CSS class for final state |
+
+**Slots**: `default`
+
+### TransitionHorizontal
+
+Horizontal slide/fade transition (0.5s hardcoded).
+
+**Props**: None | **Slots**: `default`
+
+### TransitionVertical
+
+Smooth vertical expand/collapse with height animation and opacity control.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `duration` | `number?` | `250` | Animation duration (ms) |
+| `easingEnter` | `string?` | `'ease-in-out'` | Enter easing function |
+| `easingLeave` | `string?` | `'ease-in-out'` | Leave easing function |
+| `opacityClosed` | `number?` | `0` | Opacity when closed |
+| `opacityOpened` | `number?` | `1` | Opacity when opened |
+
+**Slots**: `default`
+
+---
+
+## Layout
+
+### Collapsible
+
+Expandable/collapsible container with trigger button and vertical animation.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `default` | `boolean?` | — | Initial visibility |
+| `label` | `string?` | — | Trigger button label |
+
+**v-model**: `visible: boolean`
+**Slots**: `trigger({ visible, setVisible })`, `default({ visible, setVisible })`
+
+### Screen
+
+Responsive screen component that calculates canvas dimensions based on breakpoints.
+
+**Props**: None | **Slots**: `default({ width, height })`
+
+### Skeleton
+
+Loading placeholder with animation.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `animation` | `'pulse' \| 'wave' \| 'none'` | `'pulse'` | Animation style |
+
+**Slots**: `default`
+
+---
+
+## Misc
+
+### Button
+
+Versatile button with variants, sizes, and states.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `toggled` | `boolean?` | `false` | Toggle state |
+| `icon` | `string?` | — | UnoCSS/Iconify icon class |
+| `label` | `string?` | — | Button text |
+| `disabled` | `boolean?` | `false` | Disabled state |
+| `loading` | `boolean?` | `false` | Loading state |
+| `variant` | `'primary' \| 'secondary' \| 'secondary-muted' \| 'danger' \| 'caution' \| 'pure' \| 'ghost'` | `'primary'` | Visual variant |
+| `size` | `'sm' \| 'md' \| 'lg'` | `'md'` | Size |
+| `shape` | `'rounded' \| 'pill' \| 'square'` | `'pill'` | Shape |
+| `block` | `boolean?` | `false` | Full width |
+
+**Slots**: `default` (fallback when no `label`)
+
+### Callout
+
+Alert/callout box with themed accent bar.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `theme` | `'primary' \| 'violet' \| 'lime' \| 'orange'` | `'primary'` | Color theme |
+| `label` | `string?` | — | Title |
+
+**Slots**: `label`, `default`
+
+### ContainerError
+
+Error display with copy/feedback buttons and scrollable stack trace.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `error` | `unknown?` | — | Error object |
+| `message` | `string?` | — | Custom message |
+| `stack` | `string?` | — | Stack trace |
+| `includeStack` | `boolean?` | `true` | Show stack |
+| `showCopyButton` | `boolean?` | `true` | Show copy button |
+| `showFeedbackButton` | `boolean?` | `true` | Show feedback button |
+| `copyButtonLabel` | `string?` | `'Copy'` | Copy button text |
+| `copiedButtonLabel` | `string?` | `'Copied'` | Copied state text |
+| `feedbackButtonLabel` | `string?` | `'Feedback'` | Feedback button text |
+| `heightPreset` | `'sm' \| 'md' \| 'lg' \| 'xl' \| 'auto'` | `'md'` | Container height |
+
+**Emits**: `copy(content: string)`, `feedback()`
+
+### DoubleCheckButton
+
+Two-stage confirmation button — click once to reveal confirm/cancel.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `variant` | `ButtonVariant` | `'danger'` | Confirm button variant |
+| `cancelVariant` | `ButtonVariant` | `'secondary'` | Cancel button variant |
+| `size` | `'sm' \| 'md' \| 'lg'` | `'md'` | Size |
+| `block` | `boolean?` | `false` | Full width |
+| `disabled` | `boolean?` | `false` | Disabled |
+| `loading` | `boolean?` | `false` | Loading |
+
+**Emits**: `confirm()`, `cancel()`
+**Slots**: `default` (initial text), `confirm` (confirm text), `cancel` (cancel text)
+
+### Progress
+
+Linear progress bar with animated shine.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `progress` | `number` | *(required)* | Percentage 0–100 |
+| `barClass` | `string?` | — | Custom bar color class |
+
+---
+
+## Form — Input
+
+### Input
+
+Basic text/number input.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `type` | `InputType?` | — | HTML input type |
+| `variant` | `'primary' \| 'secondary' \| 'primary-dimmed'` | `'primary'` | Visual variant |
+| `size` | `'sm' \| 'md' \| 'lg'` | `'md'` | Size |
+
+**v-model**: `modelValue: string | number`
+
+### BasicInputFile
+
+Low-level file input with drag-drop support.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `accept` | `string?` | — | Accepted MIME types |
+| `multiple` | `boolean?` | — | Allow multiple files |
+| `isDraggingClasses` | `string \| string[]?` | — | Classes when dragging |
+| `isNotDraggingClasses` | `string \| string[]?` | — | Classes when not dragging |
+
+**v-model**: `modelValue: File[]`
+**Slots**: `default({ isDragging, firstFile, files })`
+
+### InputFile
+
+File input with preview and drag-drop UI.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `accept` | `string?` | — | Accepted file types |
+| `multiple` | `boolean?` | — | Allow multiple |
+| `placeholder` | `string?` | `'Choose file'` | Placeholder text |
+
+**v-model**: `modelValue: File[] | undefined`
+
+### InputFileCard
+
+Styled file upload card with drag-and-drop zone.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `accept` | `string?` | — | Accepted file types |
+| `multiple` | `boolean?` | — | Allow multiple |
+
+**v-model**: inherits from `BasicInputFile`
+**Slots**: `default` (custom upload UI)
+
+### InputKeyValue
+
+Two-column input for key-value pairs.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `name` | `string?` | — | Input name attribute |
+| `keyPlaceholder` | `string?` | — | Key placeholder |
+| `valuePlaceholder` | `string?` | — | Value placeholder |
+
+**v-model**: `propertyKey: string`, `propertyValue: string`
+
+---
+
+## Form — Textarea
+
+### BasicTextarea
+
+Auto-resizing textarea with submit and paste-file events.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `defaultHeight` | `string?` | — | Initial height when empty |
+| `submitOnEnter` | `boolean?` | `true` | Submit on Enter (Shift+Enter for newline) |
+
+**v-model**: `input: string`
+**Emits**: `submit(message: string)`, `pasteFile(files: File[])`
+
+### Textarea
+
+Styled textarea wrapping `BasicTextarea`.
+
+**v-model**: `modelValue: string`
+
+---
+
+## Form — Checkbox / Radio
+
+### Checkbox
+
+Toggle switch using reka-ui `SwitchRoot`.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `disabled` | `boolean?` | — | Disabled state |
+
+**v-model**: `modelValue: boolean`
+
+### Radio
+
+Single radio button for radio groups.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `id` | `string` | *(required)* | Unique ID |
+| `name` | `string` | *(required)* | Radio group name |
+| `value` | `string` | *(required)* | Option value |
+| `title` | `string` | *(required)* | Display label |
+| `deprecated` | `boolean?` | `false` | Deprecation indicator |
+
+**v-model**: `modelValue: string`
+
+---
+
+## Form — Range
+
+### Range
+
+Horizontal slider with progress visualization.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `min` | `number?` | `0` | Minimum value |
+| `max` | `number?` | `100` | Maximum value |
+| `step` | `number?` | `1` | Step increment |
+| `disabled` | `boolean?` | `false` | Disabled |
+| `thumbColor` | `string?` | `'#9090906e'` | Thumb color |
+| `trackColor` | `string?` | `'gray'` | Track color |
+| `trackValueColor` | `string?` | `'red'` | Filled track color |
+
+**v-model**: `modelValue: number`
+
+### ColorHueRange
+
+HSL hue selector (0–360) with rainbow gradient.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `disabled` | `boolean?` | — | Disabled |
+
+**v-model**: `modelValue: number`
+
+### RoundRange
+
+Rounded-style slider.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `min` | `number?` | `0` | Minimum |
+| `max` | `number?` | `100` | Maximum |
+| `step` | `number?` | `1` | Step |
+| `disabled` | `boolean?` | `false` | Disabled |
+
+**v-model**: `modelValue: number`
+
+---
+
+## Form — Select
+
+### Select
+
+Dropdown select using reka-ui with grouping and custom rendering.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `options` | `SelectOptionItem<T>[] \| SelectOptionGroupItem<T>[]` | *(required)* | Options |
+| `placeholder` | `string?` | `'Select an option'` | Placeholder |
+| `disabled` | `boolean?` | `false` | Disabled |
+| `by` | `string \| ((a: T, b: T) => boolean)?` | — | Custom comparison |
+| `contentMinWidth` | `string \| number?` | `160` | Dropdown min width |
+| `contentWidth` | `string \| number?` | — | Dropdown width |
+| `shape` | `'rounded' \| 'default'` | `'default'` | Shape |
+| `variant` | `'blurry' \| 'default'` | `'default'` | Variant |
+
+**v-model**: `modelValue: T`
+**Slots**: `value({ option, value, placeholder })`, `option({ option })`
+
+### SelectOption
+
+Individual option item within `Select`.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `option` | `SelectOptionItem<T>` | *(required)* | Option data |
+
+**Slots**: `default`
+
+---
+
+## Form — Combobox
+
+### Combobox
+
+Searchable dropdown/autocomplete using reka-ui with grouping.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `options` | `ComboboxOptionItem<T>[] \| ComboboxOptionGroupItem<T>[]` | *(required)* | Options |
+| `placeholder` | `string?` | — | Placeholder |
+| `disabled` | `boolean?` | `false` | Disabled |
+| `contentMinWidth` | `string \| number?` | — | Dropdown min width |
+| `contentWidth` | `string \| number?` | — | Dropdown width |
+
+**v-model**: `modelValue: T`
+**Slots**: `option({ option })`, `empty`
+
+### ComboboxSelect
+
+Simplified Combobox wrapper for string/number options.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `options` | `{ label, value, description?, disabled?, icon? }[]?` | — | Options |
+| `placeholder` | `string?` | — | Placeholder |
+| `disabled` | `boolean?` | `false` | Disabled |
+| `title` | `string?` | — | Title |
+| `layout` | `'horizontal' \| 'vertical'?` | — | Layout direction |
+| `contentMinWidth` | `string \| number?` | — | Dropdown min width |
+| `contentWidth` | `string \| number?` | — | Dropdown width |
+
+**v-model**: `modelValue: string | number`
+**Slots**: `option({ option })`, `empty`
+
+### ComboboxOption
+
+Option item within combobox (uses provide/inject).
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `value` | `string \| number` | *(required)* | Value |
+| `label` | `string?` | — | Display text |
+| `active` | `boolean?` | — | Active state |
+
+**Slots**: `default`
+
+---
+
+## Form — SelectTab
+
+### SelectTab
+
+Tab-like selection using radio buttons with animated indicator.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `options` | `SelectTabOption[]` | *(required)* | Tab options `{ label, value, description?, icon? }` |
+| `disabled` | `boolean?` | `false` | Disabled |
+| `readonly` | `boolean?` | `false` | Read-only |
+| `size` | `'sm' \| 'md'` | `'md'` | Size |
+
+**v-model**: `modelValue: T`
+
+---
+
+## Form — Field (Labeled wrappers)
+
+All Field components wrap a base input with `label`, `description`, and consistent layout. Common slots: `label`, `description`.
+
+### FieldInput
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `label` | `string?` | — | Label |
+| `description` | `string?` | — | Helper text |
+| `placeholder` | `string?` | — | Placeholder |
+| `required` | `boolean?` | — | Required indicator |
+| `type` | `InputType?` | — | Input type |
+| `inputClass` | `string?` | — | Custom input class |
+| `singleLine` | `boolean?` | `true` | `true` = input, `false` = textarea |
+
+**v-model**: `modelValue: T`
+
+### FieldCheckbox
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `label` | `string?` | — | Label |
+| `description` | `string?` | — | Helper text |
+| `disabled` | `boolean?` | — | Disabled |
+| `placement` | `'left' \| 'right'` | `'right'` | Switch position |
+
+**v-model**: `modelValue: boolean`
+
+### FieldTextArea
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `label` | `string?` | — | Label |
+| `description` | `string?` | — | Helper text |
+| `placeholder` | `string?` | — | Placeholder |
+| `required` | `boolean?` | — | Required indicator |
+| `textareaClass` | `string?` | — | Custom textarea class |
+| `rows` | `number?` | `6` | Rows |
+
+**v-model**: `modelValue: string`
+
+### FieldRange
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `min` | `number?` | — | Min |
+| `max` | `number?` | — | Max |
+| `step` | `number?` | — | Step |
+| `label` | `string?` | — | Label |
+| `description` | `string?` | — | Helper text |
+| `formatValue` | `(value: number) => string?` | — | Value formatter |
+| `as` | `'label' \| 'div'` | `'label'` | Wrapper element |
+
+**v-model**: `modelValue: number`
+
+### FieldInputFile
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `label` | `string?` | — | Label |
+| `description` | `string?` | — | Helper text |
+| `accept` | `string?` | — | Accepted types |
+| `multiple` | `boolean?` | — | Multiple |
+| `placeholder` | `string?` | — | Placeholder |
+
+**v-model**: `modelValue: File[] | undefined`
+
+### FieldSelect
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `label` | `string` | *(required)* | Label |
+| `description` | `string?` | — | Helper text |
+| `options` | `SelectOptionItem<T>[] \| SelectOptionGroupItem<T>[]?` | — | Options |
+| `placeholder` | `string?` | — | Placeholder |
+| `disabled` | `boolean?` | — | Disabled |
+| `layout` | `'horizontal' \| 'vertical'` | `'horizontal'` | Layout |
+| `by` | `string \| ((a, b) => boolean)?` | — | Comparison |
+| `shape` | `'rounded' \| 'default'?` | — | Shape |
+| `variant` | `'blurry' \| 'default'?` | — | Variant |
+
+**v-model**: `modelValue: T`
+**Slots**: `label`, `description`, `value`, `option`
+
+### FieldCombobox
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `label` | `string` | *(required)* | Label |
+| `description` | `string?` | — | Helper text |
+| `options` | `{ label, value, description?, disabled?, icon? }[]?` | — | Options |
+| `placeholder` | `string?` | — | Placeholder |
+| `disabled` | `boolean?` | `false` | Disabled |
+| `layout` | `'horizontal' \| 'vertical'` | `'horizontal'` | Layout |
+
+**v-model**: `modelValue: string`
+**Slots**: `label`, `description`, `option`, `empty`
+
+### FieldKeyValues
+
+Dynamic key-value pair list with add/remove.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `label` | `string?` | — | Label |
+| `description` | `string?` | — | Helper text |
+| `name` | `string?` | — | Input name |
+| `keyPlaceholder` | `string?` | — | Key placeholder |
+| `valuePlaceholder` | `string?` | — | Value placeholder |
+| `required` | `boolean?` | — | Required |
+| `inputClass` | `string?` | — | Custom input class |
+
+**v-model**: `keyValues: { key: string, value: string }[]`
+**Emits**: `remove(index: number)`, `add(key: string, value: string)`
+
+### FieldValues
+
+Dynamic string list with add/remove.
+
+| Prop | Type | Default | Description |
+|------|------|---------|-------------|
+| `label` | `string?` | — | Label |
+| `description` | `string?` | — | Helper text |
+| `name` | `string?` | — | Input name |
+| `valuePlaceholder` | `string?` | — | Value placeholder |
+| `required` | `boolean?` | — | Required |
+| `inputClass` | `string?` | — | Custom input class |
+
+**v-model**: `items: string[]`
+**Emits**: `remove(index: number)`, `add()`
+
+---
+
+## Composables
+
+Exported from `packages/ui/src/composables/`:
+
+- **`useDeferredMount()`** — Defers component mounting (useful for heavy components).
+- **`useTheme()`** — Theme management composable.