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/useWebWorkerFn.md

@@ -0,0 +1,102 @@
+---
+category: Browser
+---
+
+# useWebWorkerFn
+
+Run expensive functions without blocking the UI, using a simple syntax that makes use of Promise. A port of [alewin/useWorker](https://github.com/alewin/useWorker).
+
+## Usage
+
+### Basic example
+
+```ts
+import { useWebWorkerFn } from '@vueuse/core'
+
+const { workerFn } = useWebWorkerFn(() => {
+  // some heavy works to do in web worker
+})
+```
+
+### With dependencies
+
+```ts {7-9}
+import { useWebWorkerFn } from '@vueuse/core'
+
+const { workerFn, workerStatus, workerTerminate } = useWebWorkerFn(
+  dates => dates.sort(dateFns.compareAsc),
+  {
+    timeout: 50000,
+    dependencies: [
+      'https://cdnjs.cloudflare.com/ajax/libs/date-fns/1.30.1/date_fns.js', // dateFns
+    ],
+  },
+)
+```
+
+### With local dependencies
+
+```ts {9-9}
+import { useWebWorkerFn } from '@vueuse/core'
+
+const pow = (a: number) => a * a
+
+const { workerFn, workerStatus, workerTerminate } = useWebWorkerFn(
+  numbers => pow(numbers),
+  {
+    timeout: 50000,
+    localDependencies: [pow]
+  },
+)
+```
+
+## Web Worker
+
+Before you start using this function, we suggest you read the [Web Worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers) documentation.
+
+## Credit
+
+This function is a Vue port of https://github.com/alewin/useWorker by Alessio Koci, with the help of [@Donskelle](https://github.com/Donskelle) to migration.
+
+## Type Declarations
+
+```ts
+export type WebWorkerStatus =
+  | "PENDING"
+  | "SUCCESS"
+  | "RUNNING"
+  | "ERROR"
+  | "TIMEOUT_EXPIRED"
+export interface UseWebWorkerOptions extends ConfigurableWindow {
+  /**
+   * Number of milliseconds before killing the worker
+   *
+   * @default undefined
+   */
+  timeout?: number
+  /**
+   * An array that contains the external dependencies needed to run the worker
+   */
+  dependencies?: string[]
+  /**
+   * An array that contains the local dependencies needed to run the worker
+   */
+  localDependencies?: Function[]
+}
+export interface UseWebWorkerFnReturn<T extends (...fnArgs: any[]) => any> {
+  workerFn: (...fnArgs: Parameters<T>) => Promise<ReturnType<T>>
+  workerStatus: ShallowRef<WebWorkerStatus>
+  workerTerminate: (status?: WebWorkerStatus) => void
+}
+/**
+ * Run expensive function without blocking the UI, using a simple syntax that makes use of Promise.
+ *
+ * @see https://vueuse.org/useWebWorkerFn
+ * @param fn
+ * @param options
+ */
+export declare function useWebWorkerFn<T extends (...fnArgs: any[]) => any>(
+  fn: T,
+  options?: UseWebWorkerOptions,
+): UseWebWorkerFnReturn<T>
+```