v0.12.0

feat(ui): update theme system and improve UI consistency

• Rename default theme to hypermind and add hypermind-classic theme

• Update theme colors and ordering in theme selector

• Add Google Sans fonts and update terminal font styling

• Move sound command status to system status bar

• Update documentation and screenshots for new themes

• Cleaned up branding images

Full Changelog: v0.11.1...v0.12.0