[xtiang7c0]

Summary

• hydrate session statuses from /session/status when the session list loads
• query each session directory separately so global lists receive correct status snapshots
• preserve newer SSE status events if a snapshot request resolves later
• show an activity spinner for busy and retrying sessions

Verification

• npm test (335 passing)
• npm run typecheck
• npm run check:versions
• Android release APK build
• Nothing Phone 2a, Android 16: started work from desktop, cold-opened mobile app, and confirmed the matching session showed the activity animation

The device APK also contained the separate #210 keyboard fix. This PR contains only the session-status change.