Problem:
The /edit route should require authentication. Currently, unauthenticated users may access the route without being prompted to log in.

Tasks:

• Add a login-gate component (Login Required) before showing /edit form content.
• If not authenticated, show a clear "Login Required" prompt.
• After successful login, redirect to the originally requested /edit route.

Acceptance Criteria:

• Unauthenticated users are prompted to log in when accessing /edit.
• After login, users are directed back to their intended edit route.