Problem: 15-minute tokens with no refresh mechanism kicked users to login
even when actively using the app.
Fixes:
1. config.py: raise ACCESS_TOKEN_EXPIRE_MINUTES from 15 → 480 (8h).
Reasonable for an enterprise internal tool; still configurable via env.
2. POST /auth/refresh: new endpoint that reads the current aegis_token
cookie and issues a fresh token if the session is still valid. Returns
the new token in the cookie + body (same shape as /auth/login).
3. frontend/api/client.ts: response interceptor now attempts a silent
refresh on 401 before redirecting to login:
- Calls POST /auth/refresh once per failed request
- If refresh succeeds: retries the original request transparently
- If refresh fails: redirects to /login as before
- Deduplicates concurrent refresh attempts (refresh once, resolve all)
- Never attempts refresh on /auth/refresh or /auth/login themselves
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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