chore: add plugin to rename .module.css assets to .css in the bui…

[sofa-tata]

…ld output

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PR Summary

Medium Risk
Changes the library build output by renaming emitted CSS assets and rewriting chunk references, which could break consumers if filenames collide or expectations differ. Scope is limited to Vite/Rollup bundling behavior.

Overview
Updates vite.config.ts to include a new post-build plugin (stripCssModuleExtension) that renames emitted .module.css assets to .css and rewrites any chunk code references to match.

This aims to prevent downstream bundlers from dropping or re-processing CSS Modules when consuming the built library (class names are already hashed).

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