fix(vite): resolve tailwind hmr for mdx files

[srivtx]

Description

Fixes #364

Resolves an issue where Tailwind CSS styles didn't update in .mdx files without a manual refresh.

Changes

• Fixed Root & Scanning: Pointed Vite to the correct project root so Tailwind detects changes in user files.
• Fixed HMR: Added a plugin that automatically updates CSS when .mdx files change, giving instant feedback without reloading the page.
• Fixed Permissions: Allowed Vite to serve internal library files to prevent errors.

Verification

• Verified that changing Tailwind classes in MDX now updates instantly.
• Confirmed no page reload is needed.
• Added changeset.

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