Replace generic "Network error" with specific error messages:
- Show backend error message when available from HTTP response
- Display "Authorization required. Please complete Step 1 in
Settings → Astrolabe." for 401 Unauthorized errors
- Show "Search service unavailable" for 503 errors
- Keep generic network error only for actual connection failures
This helps users understand when they need to complete OAuth
authorization vs when there's an actual network problem.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
