feat(editor): add EOF legacy shortcut profile

[ChrisBeWithYou]

Summary

• add an editor shortcut profile selector with persisted FeedBack/EOF Legacy modes
• map high-frequency EOF timeline, snap, sustain, import, save, and technique shortcuts to existing editor commands
• add status messaging for EOF shortcuts whose editor command does not exist yet
• add pure shortcut mapping coverage

Testing

• node --check screen.js
• node tests/eof_shortcuts.test.js
• all tests/*.test.js via node

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/eof-legacy-hotkeys

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[byrongamatos]

Review pass (Claude Code). Clean, additive (0 deletions). The EOF profile is correctly gated — _editorDispatchEofShortcut only fires when editorShortcutProfile === 'eof' and the target isn't a typing field, and falls through (return false) when no command matches, so it never disturbs the default FeedBack profile. Claiming browser chords (Ctrl+S/Ctrl+F/Ctrl+T) is the intended point of an EOF-emulation profile the user explicitly opted into; modifier matching is strict (exact plain/ctrl/shift/alt combos). Mapped-but-unimplemented commands surface a status message rather than silently no-op'ing. node --check + all JS tests green (5 shortcut tests). No change needed. (Codex unavailable this session — rate limit — manual + test-backed.)