chore: consolidate new foundation and archive v1 (#1495)

v1/packages/mosaic/framework/skills/vueuse-functions/references/useWindowFocus.md

@@ -0,0 +1,42 @@
+---
+category: Elements
+---
+
+# useWindowFocus
+
+Reactively track window focus with `window.onfocus` and `window.onblur` events.
+
+## Usage
+
+```vue
+<script setup lang="ts">
+import { useWindowFocus } from '@vueuse/core';
+
+const focused = useWindowFocus();
+</script>
+
+<template>
+  <div>{{ focused }}</div>
+</template>
+```
+
+## Component Usage
+
+```vue
+<template>
+  <UseWindowFocus v-slot="{ focused }"> Document Focus: {{ focused }} </UseWindowFocus>
+</template>
+```
+
+## Type Declarations
+
+```ts
+/**
+ * Reactively track window focus with `window.onfocus` and `window.onblur`.
+ *
+ * @see https://vueuse.org/useWindowFocus
+ *
+ * @__NO_SIDE_EFFECTS__
+ */
+export declare function useWindowFocus(options?: ConfigurableWindow): ShallowRef<boolean>;
+```