feat(web): remove circle video compose flow from web client

docs/api-reference.md

@@ -67,6 +67,8 @@ For `/health/ready` failure:
 - `file`
 - `circle_video`
 
+Note: `circle_video` is kept for API/mobile parity. Web client currently sends regular `video` (no circle compose UI).
+
 ### Message status events
 
 - `message_delivered`

docs/core-checklist-status.md

@@ -24,7 +24,7 @@ Legend:
 15. Typing Realtime - `DONE` (typing start/stop + recording voice start/stop + recording video start/stop in circle-video send flow)
 16. Media & Attachments - `DONE` (upload/preview/download/gallery; sticker/GIF inline media no longer opens photo viewer on click)
 17. Voice Messages - `PARTIAL` (record/send/play/seek + global speed 1x/1.5x/2x; recorder uses improved mime priority for better duration metadata; backend media allowlist includes `audio/mp4`/`audio/x-m4a`; audio store tracks duration via `durationchange/seekable` fallback; websocket send/recorder stop race on fast chat switch is guarded; UX still being polished)
-18. Circle Video Messages - `PARTIAL` (send/play present, recording UX basic)
+18. Circle Video Messages - `PARTIAL` (mobile-priority only: backend type/realtime supported; web composer intentionally does not send circles)
 19. Stickers - `PARTIAL` (web sticker picker with preset pack + favorites)
 20. GIF - `PARTIAL` (web GIF picker with Tenor search + preset fallback + favorites)
 21. Message History/Search - `DONE` (history/pagination/chat+global search)