Phase 669: add remove-member-reaction IPC route.

Mods can remove another member's reaction via ui-flow IPC bridge.

Co-authored-by: Cursor <[email protected]>

index.js

@@ -1665,6 +1665,11 @@ async function dispatchUiMessage (platform, msg, hooks = {}) {
     pushState()
     return true
   }
+  if (t === 'remove-member-reaction') {
+    await platform.removeMemberReaction(msg.messageId, msg.emoji, msg.userId)
+    pushState()
+    return true
+  }
   if (t === 'select-home') {
     await platform.openHome()
     pushState()