fix(messages): peer avatar visibility in chat bubbles

- ConversationsContext: subscribe to profiles UPDATE realtime so
  conversation members[].profile picks up peer avatar / displayName changes
  without a manual refresh
- ConversationPage: skip call_event messages when computing run boundaries.
  Previously a peer bubble followed by a call event from the same sender
  was treated as mid-run -> avatar slot collapsed to a placeholder
- DM peer-profile fallback already added in previous commit covers transient
  member-lookup misses

apps/desktop/src/context/ConversationsContext.tsx

@@ -151,6 +151,15 @@ export function ConversationsProvider({ children }: { children: ReactNode }) {
       .on('postgres_changes', { event: '*', schema: 'public', table: 'conversations' }, () => {
         void refresh();
       })
+      .on(
+        'postgres_changes',
+        { event: 'UPDATE', schema: 'public', table: 'profiles' },
+        () => {
+          // Peer updated their profile (e.g. uploaded avatar / changed name).
+          // Re-pull conversations so members[].profile picks up the new data.
+          void refresh();
+        },
+      )
       .on(
         'postgres_changes',
         { event: 'INSERT', schema: 'public', table: 'messages' },