feat(server): completely overhaul dashboard into interactive memory hub

Added interactive knowledge graph visualization, omni-search, kanban task board, and real-time live agent activity stream.

server/src/main.rs

@@ -426,6 +426,24 @@ async fn message_handler(
     let session_id = query.session_id.clone();
     let clients = Arc::clone(&state);
 
+    let activity_msg = if let Some(method) = payload.get("method").and_then(|m| m.as_str()) {
+        if method == "tools/call" {
+            let name = payload.get("params").and_then(|p| p.get("name")).and_then(|n| n.as_str()).unwrap_or("unknown_tool");
+            Some(format!("Agent executed tool: {}", name))
+        } else {
+            None
+        }
+    } else {
+        None
+    };
+
+    if let Some(msg) = activity_msg {
+        let clients_map = clients.clients.read().unwrap().clone();
+        for tx in clients_map.values() {
+            let _ = tx.send(Ok(Event::default().event("activity").data(msg.clone())));
+        }
+    }
+
     tokio::spawn(async move {
         if let Some(response) = handler.handle_request(payload).await {
             let tx_opt = clients.clients.read().unwrap().get(&session_id).cloned();