refactor: consolidate nvim crates, extract server library, and update workspace dependencies

server/src/watcher.rs

@@ -92,4 +92,11 @@ mod tests {
         let state = Arc::new(MemoryState::new(temp_dir.path().to_str().unwrap()));
         spawn_watcher(state);
     }
+
+    #[tokio::test]
+    async fn test_spawn_watcher_invalid_path() {
+        let state = Arc::new(MemoryState::new("/nonexistent/path"));
+        spawn_watcher(state);
+    }
 }
+