feat: dynamic release fetching and website redesign

[Soumyadipgithub]

What this PR does

Closes #66. This PR moves GitHub release fetching to the client-side to ensure the website always shows the latest builds regardless of repository visibility or build timing. It also refines the download page UI with better spacing and premium styling for platform headers.

How to test

Note: Tested locally only.

1. Run cd website && npm install && npm run dev.
2. Visit http://localhost:4321/download.
3. Verify that the "Fetching..." message appears and is replaced by the actual releases.
4. Verify that the Windows, macOS, and Linux headers have generous spacing and the new design.
5. Click "Download" buttons to ensure they point to the correct GitHub assets.

Checklist

• Branch targets develop (not main)
• Branch name follows the naming convention (see CONTRIBUTING.md)
• Read CLAUDE.md before making changes
• Behaviour is unchanged or the change is intentional and described above
• Key behaviours are not broken: TTS feedback flag, VAD pre-buffer, WASAPI reinit, device fallback
• Glass design rules followed (no solid backgrounds, no Tailwind)
• No hardcoded API keys, paths, or credentials
• Tested manually with npm run dev

Screenshots (if UI changed)

After:

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	syncspeak	9ee7f4f	Commit Preview URL Branch Preview URL	Apr 24 2026, 03:09 AM