Disable analytics in PR previews

[TomGreener91]

This commit disables Google Analytics tracking in the PR preview environments. This is done by setting the VITE_GA_MEASUREMENT_ID environment variable to an empty string during the Vite build process in the .github/workflows/firebase-hosting-pull-request.yml GitHub Actions workflow. This ensures that development and staging traffic does not pollute production analytics data.

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PR created automatically by Jules for task 12891405444006929650 started by @Reddevildragg

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

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[github-actions]

Visit the preview URL for this PR (updated for commit df97129):

https://rexvelocity--pr2-remove-clsx-and-tw-m-p7qgleia.web.app

_{(expires Sun, 31 May 2026 14:07:09 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

_{Sign: e6a8092b99a21a146aa2c15690bc80339a98e50d}