chore: bump github actions to latest versions

chore(changelog): add v1.4.0 entry with demo mode changes

feat(demo): add demo modes for App Store screenshots

ci(release): automate versioning from CHANGELOG.md

docs: rename README directory to docs

refactor: restructure project with protocol-based architecture and test infrastructure

feat(ui): add right-click context menu with quit option

refactor(ui): improve menu bar with icons and cleaner structure

feat(ui): add animated processing indicators to floating record bar

fix(ui): remove ellipsis from menu bar item titles

docs: replace verbose CLAUDE.md with concise AGENTS.md

fix(ui): enlarge window to allow capsule shadow to render properly

fix(ui): ensure floating record bar gains keyboard focus for spacebar

feat(ui): add compact floating record bar with waveform visualization

refactor(settings): use native macOS Settings scene with streamlined UI