improve Firebase integration across Crashlytics, Analytics, and Performance

- Fix cold-start privacy bug: apply persisted collection preference on launch
- Disable Firebase collection in debug builds to avoid polluting prod data
- Add Crashlytics custom keys (is_logged_in, channel), user identifier, and
  WebSocket reconnection breadcrumbs for actionable crash reports
- Record non-fatal errors for server failures, WebSocket errors, and global
  asset fetch failures (skip timeouts/network errors to avoid noise)
- Update is_logged_in key and user identifier on login/logout transitions
- Log auth reconnection exhaustion before forced logout
- Add FirebaseAnalyticsObserver with named routes for automatic screen tracking
- Add static routeName constants to avoid duplicated string literals
- Add Firebase Performance Dio interceptor for automatic HTTP request tracing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/screens/home/home.dart

@@ -44,7 +44,10 @@ class _HomeState extends State<Home> {
 
       Navigator.push(
         context,
-        MaterialPageRoute(builder: (context) => const ReleaseNotes()),
+        MaterialPageRoute(
+          settings: const RouteSettings(name: ReleaseNotes.routeName),
+          builder: (context) => const ReleaseNotes(),
+        ),
       ).then((_) => prefs.setString('last_shown_version', currentVersion));
     }
   }
@@ -121,6 +124,7 @@ class _HomeState extends State<Home> {
                     onPressed: () => Navigator.push(
                       context,
                       MaterialPageRoute(
+                        settings: const RouteSettings(name: Settings.routeName),
                         builder: (context) => Settings(
                           settingsStore: context.read<SettingsStore>(),
                         ),