feat: Add GitHub support link and bump version to 1.0.2

- Add "Support on GitHub" link in the editor sidebar
- Update CSS for flex-direction column layout
- Style the GitHub link with subtle appearance

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Bump version to 1.0.1

Fix CI: disable electron-builder auto-publish

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>