- Add teamWorkspacesEnabled feature flag with isCloud guard
- Update firebaseAuthStore.getAuthHeader() to prioritize workspace token
- Add getFirebaseAuthHeader() for user-scoped endpoints
- Initialize workspace store in router guard before app loads
- Load invite from URL in GraphCanvas after app initialization
- Update CurrentUserButton to show workspace popover when enabled
BREAKING: When teamWorkspacesEnabled flag is true:
- API calls use workspace-scoped tokens
- User menu shows workspace context
- Settings panel shows workspace mode layout
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