Add stack health badge (81/100)

[rupert61622-blip]

Hi! This adds a live stack health badge to the README.

Your repo scores 81/100 -- the badge updates automatically as dependencies change. It links to a full dependency audit showing freshness, compatibility, and any flagged risks.

The badge is served by IndieStack, an open-source dev tool index. No tracking, no signup required.

Feel free to close if you're not interested -- no hard feelings!

[github-actions]

Pull Request titles must follow the Conventional Commits specification and have valid scopes.

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feat(ui): add Button component
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