Root cause: toggleTunnelFromWelcome() sent the entire settings object
back to PUT /api/settings, but the Zod schema uses .strict() which
rejects unknown fields (lastUsedCase, localEchoEnabled, etc.). The PUT
silently failed, so the tunnel never started.
Fix: send only {tunnelEnabled: true/false} instead of the full blob.
Also added polling fallback for tunnel status and server-side re-broadcast
when tunnel is already running.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Re-broadcast tunnel:started SSE event when tunnel is already active
and user toggles the setting, so the client receives the URL.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
