docs: add advanced skills for Vitest, Pinia, and Vue built-ins

Add comprehensive reference documentation for:
- Vitest: environments, projects/workspaces, type testing, vi utilities
- Pinia: HMR, Nuxt integration, SSR setup
- Vue: built-in components (Transition, Teleport, Suspense, KeepAlive) and advanced directives

.agents/skills/vueuse-functions/references/useWebWorker.md

@@ -0,0 +1,60 @@
+---
+category: Browser
+related: useWebWorkerFn
+---
+
+# useWebWorker
+
+Simple [Web Workers](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers) registration and communication.
+
+## Usage
+
+```ts
+import { useWebWorker } from '@vueuse/core'
+
+const { data, post, terminate, worker } = useWebWorker('/path/to/worker.js')
+```
+
+| State  | Type                              | Description                                                                                          |
+| ------ | --------------------------------- | ---------------------------------------------------------------------------------------------------- |
+| data   | `Ref<any>`                        | Reference to the latest data received via the worker, can be watched to respond to incoming messages |
+| worker | `ShallowRef<Worker \| undefined>` | Reference to the instance of the WebWorker                                                           |
+
+| Method    | Signature                                                                                                                     | Description                      |
+| --------- | ----------------------------------------------------------------------------------------------------------------------------- | -------------------------------- |
+| post      | `(message: any, transfer: Transferable[]): void`<br>`(message: any, options?: StructuredSerializeOptions \| undefined): void` | Sends data to the worker thread. |
+| terminate | `() => void`                                                                                                                  | Stops and terminates the worker. |
+
+## Type Declarations
+
+```ts
+type PostMessage = (typeof Worker.prototype)["postMessage"]
+export interface UseWebWorkerReturn<Data = any> {
+  data: Ref<Data>
+  post: PostMessage
+  terminate: () => void
+  worker: ShallowRef<Worker | undefined>
+}
+type WorkerFn = (...args: unknown[]) => Worker
+/**
+ * Simple Web Workers registration and communication.
+ *
+ * @see https://vueuse.org/useWebWorker
+ * @param url
+ * @param workerOptions
+ * @param options
+ */
+export declare function useWebWorker<T = any>(
+  url: string,
+  workerOptions?: WorkerOptions,
+  options?: ConfigurableWindow,
+): UseWebWorkerReturn<T>
+/**
+ * Simple Web Workers registration and communication.
+ *
+ * @see https://vueuse.org/useWebWorker
+ */
+export declare function useWebWorker<T = any>(
+  worker: Worker | WorkerFn,
+): UseWebWorkerReturn<T>
+```