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/toRefs.md

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+---
+category: Reactivity
+---
+
+# toRefs
+
+Extended [`toRefs`](https://vuejs.org/api/reactivity-utilities.html#torefs) that also accepts refs of an object.
+
+## Usage
+
+<!-- eslint-disable array-bracket-spacing -->
+<!-- eslint-disable ts/no-redeclare -->
+
+```ts
+import { toRefs } from '@vueuse/core'
+import { reactive, ref } from 'vue'
+
+const objRef = ref({ a: 'a', b: 0 })
+const arrRef = ref(['a', 0])
+
+const { a, b } = toRefs(objRef)
+const [a, b] = toRefs(arrRef)
+
+const obj = reactive({ a: 'a', b: 0 })
+const arr = reactive(['a', 0])
+
+const { a, b } = toRefs(obj)
+const [a, b] = toRefs(arr)
+```
+
+## Use-cases
+
+### Destructuring a props object
+
+```vue
+<script lang="ts">
+import { toRefs, useVModel } from '@vueuse/core'
+
+export default {
+  setup(props) {
+    const refs = toRefs(useVModel(props, 'data'))
+
+    console.log(refs.a.value) // props.data.a
+    refs.a.value = 'a' // emit('update:data', { ...props.data, a: 'a' })
+
+    return { ...refs }
+  }
+}
+</script>
+
+<template>
+  <div>
+    <input v-model="a" type="text">
+    <input v-model="b" type="text">
+  </div>
+</template>
+```
+
+## Type Declarations
+
+```ts
+export interface ToRefsOptions {
+  /**
+   * Replace the original ref with a copy on property update.
+   *
+   * @default true
+   */
+  replaceRef?: MaybeRefOrGetter<boolean>
+}
+/**
+ * Extended `toRefs` that also accepts refs of an object.
+ *
+ * @see https://vueuse.org/toRefs
+ * @param objectRef A ref or normal object or array.
+ * @param options Options
+ */
+export declare function toRefs<T extends object>(
+  objectRef: MaybeRef<T>,
+  options?: ToRefsOptions,
+): ToRefs<T>
+```