feat(lsp): add extension inference and improve diagnostics

🤖 Generated with assistance of OhMyOpenCode

src/tools/lsp/lsp-server.ts

@@ -52,6 +52,9 @@ class LSPServerManager {
     this.cleanupInterval = setInterval(() => {
       this.cleanupIdleClients();
     }, 60000);
+    if (typeof this.cleanupInterval === "object" && "unref" in this.cleanupInterval) {
+      this.cleanupInterval.unref();
+    }
   }
 
   private cleanupIdleClients(): void {