ChatCrystal v0.5.1

Desktop Updates

• Added a manual Electron update check backed by GitHub Releases, with support for v* and electron-v* release tags.
• Added update entry points in the tray menu and Settings page while keeping the application menu unchanged.
• Reused the existing bottom prompt area so available-update copy can replace the GitHub Star prompt without adding another banner.
• Kept automatic update checks non-disruptive: failures stay silent, while manual failures show a release-page fallback.
• Added persisted update reminder and skipped-version state so users can defer or skip a version without repeated prompts.