feat(realtime): add voice/video recording activity events

docs/api-reference.md

@@ -72,6 +72,15 @@ For `/health/ready` failure:
 - `message_delivered`
 - `message_read`
 
+### Realtime chat activity events
+
+- `typing_start`
+- `typing_stop`
+- `recording_voice_start`
+- `recording_voice_stop`
+- `recording_video_start`
+- `recording_video_stop`
+
 ## 3. Models (request/response)
 
 ## 3.1 Auth

docs/core-checklist-status.md

@@ -21,7 +21,7 @@ Legend:
 12. Pinning - `DONE` (message/chat pin-unpin)
 13. Reactions - `DONE`
 14. Delivery Status - `DONE` (sent/delivered/read + reconnect reconciliation after backend restarts)
-15. Typing Realtime - `PARTIAL` (typing start/stop done; voice/video typing signals limited)
+15. Typing Realtime - `DONE` (typing start/stop + recording voice/video start/stop via realtime events)
 16. Media & Attachments - `DONE` (upload/preview/download/gallery)
 17. Voice Messages - `PARTIAL` (record/send/play/seek + global speed 1x/1.5x/2x; recorder now uses mime fallback + chunked capture; UX still being polished)
 18. Circle Video Messages - `PARTIAL` (send/play present, recording UX basic)