[GUI] refreshSettings error silently swallowed

[Vantalens]

File: packages/gui/src/App.tsx:141

Severity: Low

Description:
Provider/model fetch errors are hidden; user sees stale or empty provider list without knowing why, cannot diagnose API failures.

Code:

refreshSettings().catch(() => undefined);

Failure Scenario:
Daemon API returns 500 or network fails → catch silently swallows → user sees empty provider list → no error message → can't diagnose why settings won't load.

Suggested Fix:
Log error to console or show non-critical error indicator.