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/useJwt.md

@@ -0,0 +1,57 @@
+---
+category: '@Integrations'
+---
+
+# useJwt
+
+Wrapper for [`jwt-decode`](https://github.com/auth0/jwt-decode).
+
+## Install
+
+```bash
+npm install jwt-decode@^4
+```
+
+## Usage
+
+```ts
+import { useJwt } from '@vueuse/integrations/useJwt'
+import { defineComponent } from 'vue'
+
+const encodedJwt = ref('eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwiaWF0IjoxNTE2MjM5MDIyfQ.L8i6g3PfcHlioHCCPURC9pmXT7gdJpx3kOoyAfNUwCc')
+const { header, payload } = useJwt(encodedJwt)
+```
+
+## Type Declarations
+
+```ts
+export interface UseJwtOptions<Fallback> {
+  /**
+   * Value returned when encounter error on decoding
+   *
+   * @default null
+   */
+  fallbackValue?: Fallback
+  /**
+   * Error callback for decoding
+   */
+  onError?: (error: unknown) => void
+}
+export interface UseJwtReturn<Payload, Header, Fallback> {
+  header: ComputedRef<Header | Fallback>
+  payload: ComputedRef<Payload | Fallback>
+}
+/**
+ * Reactive decoded jwt token.
+ *
+ * @see https://vueuse.org/useJwt
+ */
+export declare function useJwt<
+  Payload extends object = JwtPayload,
+  Header extends object = JwtHeader,
+  Fallback = null,
+>(
+  encodedJwt: MaybeRefOrGetter<string>,
+  options?: UseJwtOptions<Fallback>,
+): UseJwtReturn<Payload, Header, Fallback>
+```