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/useZoomFactor.md

@@ -0,0 +1,53 @@
+---
+category: '@Electron'
+---
+
+# useZoomFactor
+
+Reactive [WebFrame](https://www.electronjs.org/docs/api/web-frame#webframe) zoom factor.
+
+## Usage
+
+```ts
+import { useZoomFactor } 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 factor = useZoomFactor()
+console.log(factor.value) // print current zoom factor
+factor.value = 2 // change current zoom factor
+```
+
+Set initial zoom factor immediately
+
+```ts
+import { useZoomFactor } from '@vueuse/electron'
+
+const factor = useZoomFactor(2)
+```
+
+Pass a `ref` and the factor will be updated when the source ref changes
+
+```ts
+import { useZoomFactor } from '@vueuse/electron'
+import { shallowRef } from 'vue'
+
+const factor = shallowRef(1)
+
+useZoomFactor(factor) // zoom factor will match with the ref
+
+factor.value = 2 // zoom factor will change
+```
+
+## Type Declarations
+
+```ts
+export declare function useZoomFactor(factor: MaybeRef<number>): Ref<number>
+export declare function useZoomFactor(
+  webFrame: WebFrame,
+  factor: MaybeRef<number>,
+): Ref<number>
+export declare function useZoomFactor(webFrame: WebFrame): Ref<number>
+export declare function useZoomFactor(): Ref<number>
+```