feat(FN-1862): add completion state tracking for onboarding

- Add markOnboardingCompleted() to set completedAt timestamp when user finishes onboarding
- Add isOnboardingCompleted() to check if onboarding was completed (vs dismissed)
- Update ModelOnboardingModal to call markOnboardingCompleted on successful completion
- Skip onboarding auto-open when already completed locally
- Add completion state tracking tests in ModelOnboardingModal.test.tsx
- Add model-onboarding-state unit tests
- Update useAuthOnboarding to check local completion state before auto-opening
- Document localStorage completion state tracking pattern in .fusion/memory.md

packages/mobile/src/plugins/deep-links.ts

@@ -26,9 +26,6 @@ type AppListenerHandle = { remove: () => Promise<void> };
 
 type HashChangeEventHandler = (event: HashChangeEvent) => void;
 
-/** Fallback listener type for untyped event handling */
-type FallbackListener = (...args: unknown[]) => void;
-
 export class DeepLinkManager extends EventEmitter {
   private readonly scheme: string;
   private readonly universalLinkHosts: string[];
@@ -47,8 +44,8 @@ export class DeepLinkManager extends EventEmitter {
     event: K,
     listener: (payload: DeepLinkEventMap[K]) => void,
   ): this;
-  override on(event: string | symbol, listener: FallbackListener): this;
-  override on(event: string | symbol, listener: FallbackListener): this {
+  override on(event: string | symbol, listener: (...args: any[]) => void): this;
+  override on(event: string | symbol, listener: (...args: any[]) => void): this {
     return super.on(event, listener);
   }
 
@@ -56,8 +53,8 @@ export class DeepLinkManager extends EventEmitter {
     event: K,
     listener: (payload: DeepLinkEventMap[K]) => void,
   ): this;
-  override off(event: string | symbol, listener: FallbackListener): this;
-  override off(event: string | symbol, listener: FallbackListener): this {
+  override off(event: string | symbol, listener: (...args: any[]) => void): this;
+  override off(event: string | symbol, listener: (...args: any[]) => void): this {
     return super.off(event, listener);
   }
 

packages/mobile/src/plugins/push-notifications.ts

@@ -34,9 +34,6 @@ export interface PushNotificationManagerOptions {
 
 type PushNotificationsModule = typeof import("@capacitor/push-notifications");
 
-/** Fallback listener type for untyped event handling */
-type FallbackListener = (...args: unknown[]) => void;
-
 export class PushNotificationManager extends EventEmitter {
   private deviceToken: string | undefined;
   private ntfyBaseUrl: string;
@@ -59,8 +56,8 @@ export class PushNotificationManager extends EventEmitter {
     eventName: K,
     listener: (payload: PushNotificationEventMap[K]) => void,
   ): this;
-  override on(eventName: string | symbol, listener: FallbackListener): this;
-  override on(eventName: string | symbol, listener: FallbackListener): this {
+  override on(eventName: string | symbol, listener: (...args: any[]) => void): this;
+  override on(eventName: string | symbol, listener: (...args: any[]) => void): this {
     return super.on(eventName, listener);
   }
 
@@ -68,8 +65,8 @@ export class PushNotificationManager extends EventEmitter {
     eventName: K,
     listener: (payload: PushNotificationEventMap[K]) => void,
   ): this;
-  override off(eventName: string | symbol, listener: FallbackListener): this;
-  override off(eventName: string | symbol, listener: FallbackListener): this {
+  override off(eventName: string | symbol, listener: (...args: any[]) => void): this;
+  override off(eventName: string | symbol, listener: (...args: any[]) => void): this {
     return super.off(eventName, listener);
   }
 

packages/mobile/src/plugins/share.ts

@@ -29,9 +29,6 @@ type ShareCapacitorResult = {
   activityType?: string;
 };
 
-/** Fallback listener type for untyped event handling */
-type FallbackListener = (...args: unknown[]) => void;
-
 export class ShareManager extends EventEmitter {
   private readonly deepLinkBaseUrl: string;
   private initialized = false;
@@ -46,8 +43,8 @@ export class ShareManager extends EventEmitter {
     event: K,
     listener: (payload: ShareEventMap[K]) => void,
   ): this;
-  override on(event: string | symbol, listener: FallbackListener): this;
-  override on(event: string | symbol, listener: FallbackListener): this {
+  override on(event: string | symbol, listener: (...args: any[]) => void): this;
+  override on(event: string | symbol, listener: (...args: any[]) => void): this {
     return super.on(event, listener);
   }
 
@@ -55,8 +52,8 @@ export class ShareManager extends EventEmitter {
     event: K,
     listener: (payload: ShareEventMap[K]) => void,
   ): this;
-  override off(event: string | symbol, listener: FallbackListener): this;
-  override off(event: string | symbol, listener: FallbackListener): this {
+  override off(event: string | symbol, listener: (...args: any[]) => void): this;
+  override off(event: string | symbol, listener: (...args: any[]) => void): this {
     return super.off(event, listener);
   }