Workspaces 3 create a workspace (#8221)

## Summary

Add workspace creation and management (create, edit, delete, leave,
switch workspaces).

  Follow-up PR will add invite and membership flow.

  ## Changes

  - Workspace CRUD dialogs
  - Workspace switcher popover in topbar
  - Workspace settings panel
  - Subscription panel for workspace context
  

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8221-Workspaces-3-create-a-workspace-2ef6d73d36508155975ffa6e315971ec)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

src/stores/firebaseAuthStore.ts

@@ -512,6 +512,7 @@ export const useFirebaseAuthStore = defineStore('firebaseAuth', () => {
     sendPasswordReset,
     updatePassword: _updatePassword,
     deleteAccount: _deleteAccount,
-    getAuthHeader
+    getAuthHeader,
+    getFirebaseAuthHeader
   }
 })