feat(editor): add shortcut command controls

[ChrisBeWithYou]

Summary

• add a Shortcut Controls panel from the editor toolbar
• list implemented shortcut-backed commands as clickable controls
• show planned-but-unwired commands as disabled rows
• keep EOF Legacy key labels accurate while avoiding overclaiming unfinished FeedBack-native bindings
• cover command row metadata in the shortcut mapping tests

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/editor-shortcut-controls

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_{Comment @coderabbitai help to get the list of available commands.}

[byrongamatos]

Review pass (Claude Code). Clean, additive. The command catalog + _editorShortcutRowsPure + panel render are internally consistent: ready rows are clickable and dispatch through the shared _editorRunEofCommand runner (profile-independent — the panel is a clickable command palette, not keyboard-bound), planned rows are disabled (and editorRunShortcutCommand also guards them with a status message). The deliberate choice to surface only save's key for the FeedBack profile matches your stated intent (avoid overclaiming native bindings until #55 wires them) and is covered by the 'does not overstate' test. node --check + all JS tests green (7 shortcut tests). No change needed. (Codex unavailable this session — rate limit — manual + test-backed.)