feat(realtime): emit recording_video activity in circle-video flow

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 + recording voice start/stop live; recording video start/stop wired in protocol, pending full UI emitter flow)
+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)
 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)

web/src/components/MessageComposer.tsx

@@ -828,6 +828,12 @@ export function MessageComposer() {
     if (!selectedFiles.length || !activeChatId || !me) {
       return;
     }
+    const isCircleVideoFlow =
+      selectedFiles.length === 1 && inferType(selectedFiles[0]) === "video" && sendAsCircle;
+    if (isCircleVideoFlow) {
+      emitTypingStopIfActive();
+      sendRealtimeChatEvent("recording_video_start");
+    }
     setIsUploading(true);
     setUploadError(null);
     setUploadProgress(0);
@@ -895,6 +901,9 @@ export function MessageComposer() {
     } finally {
       setIsUploading(false);
       setUploadProgress(0);
+      if (isCircleVideoFlow) {
+        sendRealtimeChatEvent("recording_video_stop");
+      }
     }
     if (previewUrl) {
       URL.revokeObjectURL(previewUrl);