- SSE recovery: retry syncSessionState on stream failure or natural close
- Periodic 20s polling fallback while monitorJob is active in foreground
- syncSessionState retries after 5s when runtime status fetch fails
- isSending 5s safety timeout to prevent permanent send block
- Prompt history and swipe hint colors changed to neutral grays
- Swipe hint fades out/in inversely with waveform visibility
- Session list excludes subagent sessions via roots=true API param