feat(ui): add 8s P2P slow-connect hint + i18n; document full connection feedback flows
- Hook (useConnectionFeedback):
- Add SLOW_RTC_MS=8000 timer when entering negotiating
- Foreground-only; pending while hidden; show once per negotiation attempt
- Clear timers on connect/disconnect; reset attempt flags when leaving negotiating
- Cleanup timers on unmount
- i18n:
- Add required key ClipboardApp.rtc_slow to types
- Provide translations for zh, en, ja, es, de, fr, ko
- Docs:
- flows.zh-CN: add UI connection feedback state machine covering
join_inProgress (immediate), join_slow (3s), join_timeout (15s),
rtc_negotiating, rtc_slow (8s), rtc_connected, rtc_reconnecting, rtc_restored;
document equivalent success signals and visibility gating
- code-map.zh-CN: outline responsibilities/locations for useRoomManager (join slow/timeout)
and useConnectionFeedback (negotiation slow, reconnect/restored)
david_bai
761921684c