The "Check Proxy Nodes" button in Settings > Diagnostics was returning
403 Forbidden due to missing CSRF token. The frontend was using native
fetch() instead of apiFetch() which automatically includes CSRF tokens
for POST requests.
Fixed three endpoints in Settings.tsx:
- /api/diagnostics (GET) - for consistency
- /api/diagnostics/temperature-proxy/register-nodes (POST) - reported issue
- /api/diagnostics/docker/prepare-token (POST) - same bug
Note: Export/import config endpoints intentionally continue using native
fetch() because they need custom 401/403 handling to show the API token
modal instead of redirecting to login.
7815b45483