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/createGenericProjection.md

@@ -0,0 +1,25 @@
+---
+category: '@Math'
+---
+
+# createGenericProjection
+
+Generic version of `createProjection`. Accepts a custom projector function to map arbitrary type of domains.
+
+Refer to `createProjection` and `useProjection`
+
+## Type Declarations
+
+```ts
+export type ProjectorFunction<F, T> = (
+  input: F,
+  from: readonly [F, F],
+  to: readonly [T, T],
+) => T
+export type UseProjection<F, T> = (input: MaybeRefOrGetter<F>) => ComputedRef<T>
+export declare function createGenericProjection<F = number, T = number>(
+  fromDomain: MaybeRefOrGetter<readonly [F, F]>,
+  toDomain: MaybeRefOrGetter<readonly [T, T]>,
+  projector: ProjectorFunction<F, T>,
+): UseProjection<F, T>
+```