Fix footer git SHA injection for Netlify builds

[Copilot]

import.meta.env.VITE_GIT_SHA was undefined in production builds, causing the footer to display "undefined" as link text pointing to /commit/undefined.

Changes

• vite.config.ts: Inject git SHA at build time via define option

  • Primary: git rev-parse --short HEAD
  • Fallback: VITE_GIT_SHA or COMMIT_REF env vars (Netlify)
  • Returns undefined if unavailable

• Footer.tsx: Conditionally render commit link only when SHA is defined

• package.json: Remove redundant VITE_GIT_SHA from scripts (now handled by Vite)

Before

After

Original prompt

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This section details on the original issue you should resolve

<issue_title>Footer shows “undefined” link and incorrect GitHub commit URL</issue_title>
<issue_description>The footer displays a link with the text undefined, and the generated URL points to /commit/undefined. This happens because import.meta.env.VITE_GIT_SHA is not defined during the build.

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Footer shows “undefined” link and incorrect GitHub commit URL #69

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