fix(server): safely drop detached tokio join handles and refactor timestamp boilerplate

server/src/state.rs

@@ -42,12 +42,12 @@ impl MemoryState {
             .duration_since(std::time::UNIX_EPOCH)
             .unwrap_or_default()
             .as_millis() as u64;
-            
+
         let item = serde_json::json!({
             "time": time,
             "message": message
         });
-        
+
         self.recent_activities.modify(|activities| {
             activities.push_back(item.clone());
             if activities.len() > 100 {
@@ -79,7 +79,7 @@ impl MemoryState {
         if let Ok(new_idx) = MemoryIndex::new(&self.base_dir) {
             let state = Arc::clone(self);
             let idx = new_idx.clone();
-            
+
             tokio::task::spawn_blocking(move || {
                 state.graph.read_with(|g| {
                     for e in g.entities.values() {
@@ -101,7 +101,9 @@ impl MemoryState {
                         idx.add_adr_sync(a);
                     }
                 });
-            }).await.unwrap_or_else(|e| {
+            })
+            .await
+            .unwrap_or_else(|e| {
                 tracing::error!("Failed to join tantivy index rebuild thread: {}", e);
             });