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/useGeolocation.md

@@ -0,0 +1,63 @@
+---
+category: Sensors
+---
+
+# useGeolocation
+
+Reactive [Geolocation API](https://developer.mozilla.org/en-US/docs/Web/API/Geolocation_API). It allows the user to provide their location to web applications if they so desire. For privacy reasons, the user is asked for permission to report location information.
+
+## Usage
+
+```ts
+import { useGeolocation } from '@vueuse/core'
+
+const { coords, locatedAt, error, resume, pause } = useGeolocation()
+```
+
+| State     | Type                                                                          | Description                                                              |
+| --------- | ----------------------------------------------------------------------------- | ------------------------------------------------------------------------ |
+| coords    | [`Coordinates`](https://developer.mozilla.org/en-US/docs/Web/API/Coordinates) | information about the position retrieved like the latitude and longitude |
+| locatedAt | `Date`                                                                        | The time of the last geolocation call                                    |
+| error     | `string`                                                                      | An error message in case geolocation API fails.                          |
+| resume    | `function`                                                                    | Control function to resume updating geolocation                          |
+| pause     | `function`                                                                    | Control function to pause updating geolocation                           |
+
+## Config
+
+`useGeolocation` function takes [PositionOptions](https://developer.mozilla.org/en-US/docs/Web/API/PositionOptions) object as an optional parameter.
+
+## Component Usage
+
+```vue
+<template>
+  <UseGeolocation v-slot="{ coords: { latitude, longitude } }">
+    Latitude: {{ latitude }}
+    Longitude: {{ longitude }}
+  </UseGeolocation>
+</template>
+```
+
+## Type Declarations
+
+```ts
+export interface UseGeolocationOptions
+  extends Partial<PositionOptions>, ConfigurableNavigator {
+  immediate?: boolean
+}
+export interface UseGeolocationReturn extends Supportable {
+  coords: Ref<Omit<GeolocationPosition["coords"], "toJSON">>
+  locatedAt: ShallowRef<number | null>
+  error: ShallowRef<GeolocationPositionError | null>
+  resume: () => void
+  pause: () => void
+}
+/**
+ * Reactive Geolocation API.
+ *
+ * @see https://vueuse.org/useGeolocation
+ * @param options
+ */
+export declare function useGeolocation(
+  options?: UseGeolocationOptions,
+): UseGeolocationReturn
+```