v0.1.2

Changelog

• 3c93f08 ci: add GitHub Actions workflow to generate demo.gif via VHS
• db4affc ci: use GIF_TOKEN for automatic demo.gif commits to main
• da014c9 feat(tui): custom color theme, version check, and self-update
• dc183f1 feat: add NEXUS ASCII art to README header and TUI menu
• df5b0d4 fix(ci): correct VHS module path and ttyd download URL
• 9a5793f fix(ci): install VHS manually instead of broken vhs-action
• 578346e fix(ci): upload demo.gif as artifact, handle branch protection
• 46bfbee fix(tui): enable AltScreen for proper full-screen rendering
• 210dc38 fix: pre-release security and bug fixes