feat: granular WebSocket message.new events

- WebSocket now detects new ContactMessages and broadcasts
  message.new events with contactId, text, channel, direction
- Frontend handles message.new: refreshes timeline for open chat,
  refreshes contacts for sidebar preview update
- dashboard.changed still fires for non-message changes

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/app/components/workspace/CrmWorkspaceApp.vue

@@ -659,6 +659,14 @@ const { crmRealtimeState, startCrmRealtime, stopCrmRealtime } = useCrmRealtime({
   onDashboardChanged: async () => {
     await Promise.all([refetchAllCrmQueries(), loadTelegramConnectStatus()]);
   },
+  onNewMessage: (msg) => {
+    // If the message is for the currently open thread → refresh its timeline
+    if (msg.contactId === selectedCommThreadId.value) {
+      void refreshSelectedClientTimeline(selectedCommThreadId.value);
+    }
+    // Refresh contacts to update sidebar preview (lastMessageText, lastAt)
+    void refetchContacts();
+  },
 });
 
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