fix: redirect unverified users to verification page from Login button (refs #53)

When a user signs up but doesn't verify their email, clicking the Login
button on the landing page would either do nothing or get stuck in a
loading state. Now checks for pendingVerificationEmail in localStorage
(set during signup) and redirects to /verify-email instead of attempting
Auth0 login.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/pages/HomePage.tsx

@@ -26,6 +26,14 @@ export const HomePage = () => {
       return;
     }
 
+    // Check if user has a pending email verification (signed up but not verified)
+    const pendingVerificationEmail = localStorage.getItem('pendingVerificationEmail');
+    if (pendingVerificationEmail) {
+      // Redirect to verify-email page with the stored email
+      navigate('/verify-email', { state: { email: pendingVerificationEmail } });
+      return;
+    }
+
     loginWithRedirect({ appState: { returnTo: '/garage' } });
   };