feat(stage-capcitor): added Capacitor of stage for iOS (#845)

---------

Co-authored-by: Makito <i@maki.to>

packages/stage-shared/src/beat-sync/detector.ts

@@ -43,6 +43,8 @@ export type CreateBeatSyncDetectorOptions = |
   }
   | {
     env: StageEnvironment.Web
+  } | {
+    env: StageEnvironment.Capacitor
   }
 
 export function createBeatSyncDetector(options: CreateBeatSyncDetectorOptions): BeatSyncDetector {

packages/stage-shared/src/environment.ts

@@ -1,5 +1,6 @@
 export enum StageEnvironment {
   Web = 'web',
+  Capacitor = 'capacitor',
   Tamagotchi = 'tamagotchi',
 }
 
@@ -7,6 +8,10 @@ export function isStageWeb(): boolean {
   return !import.meta.env.RUNTIME_ENVIRONMENT || import.meta.env.RUNTIME_ENVIRONMENT === 'browser'
 }
 
+export function isStageCapacitor(): boolean {
+  return import.meta.env.RUNTIME_ENVIRONMENT === 'capacitor'
+}
+
 export function isStageTamagotchi(): boolean {
   return import.meta.env.RUNTIME_ENVIRONMENT === 'electron'
 }