feat: implement silent auto-updater with Liquid Glass restart prompt

[Soumyadipgithub]

What this PR does

Closes #57

This PR implements a silent auto-updater using Tauri plugins (tauri-plugin-updater and tauri-plugin-process). It includes background polling and downloading of updates. Once an update is fully downloaded and ready to install, a seamless "Liquid Glass" restart prompt appears in the bottom right corner so the user can easily restart the application to apply the update without being interrupted.

How to test

1. Ensure npm run dev starts the application successfully without errors.
2. Since there is no newer release on GitHub yet, the update prompt will remain hidden.
3. To manually test the UI, temporarily remove if (updateStatus !== 'ready' || !updateAvailable) { return null } in UpdatePrompt.tsx and supply dummy data. You will see the Liquid Glass modal.

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)

(Invisible until update is ready. The UI matches Liquid Glass CSS tokens (--glass-bg, --liquid-blur, etc.))

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	syncspeak	1d30e9b	Commit Preview URL Branch Preview URL	Apr 23 2026, 05:58 AM