refactor(toolkit): type source any with proper types

Genuinely type composable any usages (useStepper/useStorage/useForm/
createEventHook/useSorted/etc.) as proper generics/unknown; keep idiomatic
any-function and overload-impl signatures with comments; skipped test -> .todo.

vue/toolkit/eslint.config.ts

@@ -1,3 +1,3 @@
-import { base, compose, imports, stylistic, typescript, vitest, vue } from '@robonen/eslint';
+import { base, compose, imports, stylistic, tests, typescript, vitest, vue } from '@robonen/eslint';
 
-export default compose(base, typescript, vue, vitest, imports, stylistic);
+export default compose(base, typescript, vue, vitest, imports, stylistic, tests);