Improve Google Workspace authentication error handling and feedback

src/components/GoogleWorkspaceHub.tsx

@@ -110,13 +110,20 @@ export const GoogleWorkspaceHub: React.FC<GoogleWorkspaceHubProps> = ({
           email: res.user.email || 'connected@gmail.com',
           name: res.user.displayName || 'Connected User'
         });
-        showToast('Google Workspace connected successfully with Sheets, Drive, Docs & Keep!');
+        showToast('✓ Google Workspace connected successfully (Sheets, Drive, Docs & Keep permissions granted)!');
         loadDriveFiles(res.accessToken);
       }
     } catch (err: any) {
-      // Friendly fallback status if popup was closed or environment mock
-      setIsConnected(true);
-      showToast('Connected in Workspace Sandbox mode.');
+      console.error("Google Sign-In Error Details:", err);
+      // Display actual error message to the user
+      const msg = err?.message || String(err);
+      if (msg.includes('popup-closed-by-user')) {
+        showToast('Sign-in window closed before completing.');
+      } else if (msg.includes('auth/unauthorized-domain')) {
+        showToast('Error: http://localhost:3000 needs to be added to Authorized Domains in Firebase Auth Console.');
+      } else {
+        showToast(`Google Sign-In Notice: ${msg}`);
+      }
     }
   };