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/useZoomLevel.md

@@ -0,0 +1,53 @@
+---
+category: '@Electron'
+---
+
+# useZoomLevel
+
+Reactive [WebFrame](https://www.electronjs.org/docs/api/web-frame#webframe) zoom level.
+
+## Usage
+
+```ts
+import { useZoomLevel } from '@vueuse/electron'
+
+// enable nodeIntegration if you don't provide webFrame explicitly
+// see: https://www.electronjs.org/docs/api/webview-tag#nodeintegration
+// Ref result will return
+const level = useZoomLevel()
+console.log(level.value) // print current zoom level
+level.value = 2 // change current zoom level
+```
+
+Set initial zoom level immediately
+
+```ts
+import { useZoomLevel } from '@vueuse/electron'
+
+const level = useZoomLevel(2)
+```
+
+Pass a `ref` and the level will be updated when the source ref changes
+
+```ts
+import { useZoomLevel } from '@vueuse/electron'
+import { shallowRef } from 'vue'
+
+const level = shallowRef(1)
+
+useZoomLevel(level) // zoom level will match with the ref
+
+level.value = 2 // zoom level will change
+```
+
+## Type Declarations
+
+```ts
+export declare function useZoomLevel(level: MaybeRef<number>): Ref<number>
+export declare function useZoomLevel(
+  webFrame: WebFrame,
+  level: MaybeRef<number>,
+): Ref<number>
+export declare function useZoomLevel(webFrame: WebFrame): Ref<number>
+export declare function useZoomLevel(): Ref<number>
+```