fix: TypeScript CSS import declarations missing from most examples #254
Description
Context
Discovered during development of the showcase example (PR #252).
Problem
TypeScript (especially with newer versions) requires a declare module '*.css' declaration to handle bare CSS imports without type errors. Currently only the refresh-token example has a vite-env.d.ts file with this declaration. Other examples that import CSS files are missing this, which causes TypeScript errors.
Impact
Building or type-checking examples other than refresh-token can fail or produce TypeScript errors related to CSS module imports.
Proposed Action
Add a vite-env.d.ts (or equivalent ambient declaration) to each example that imports CSS files, or add a shared ambient declaration that all examples can reference.