feat(filetree): add filesystem watch support to WebContainer environment and auto-refresh file tree; improve icon handling and context menu behavior

ts_web/elements/00group-runtime/environments/WebContainerEnvironment.ts

@@ -1,5 +1,5 @@
 import * as webcontainer from '@webcontainer/api';
-import type { IExecutionEnvironment, IFileEntry, IProcessHandle } from '../interfaces/IExecutionEnvironment.js';
+import type { IExecutionEnvironment, IFileEntry, IFileWatcher, IProcessHandle } from '../interfaces/IExecutionEnvironment.js';
 
 /**
  * WebContainer-based execution environment.
@@ -123,6 +123,22 @@ export class WebContainerEnvironment implements IExecutionEnvironment {
     }
   }
 
+  public watch(
+    path: string,
+    callback: (event: 'rename' | 'change', filename: string | null) => void,
+    options?: { recursive?: boolean }
+  ): IFileWatcher {
+    this.ensureReady();
+    const watcher = this.container!.fs.watch(
+      path,
+      { recursive: options?.recursive ?? false },
+      callback
+    );
+    return {
+      stop: () => watcher.close(),
+    };
+  }
+
   // ============ Process Execution ============
 
   public async spawn(command: string, args: string[] = []): Promise<IProcessHandle> {