feat(editor): add tempo map toggle command

[ChrisBeWithYou]

Summary

• add an enter/exit Tempo Map command to the shortcut command registry
• route FeedBack T through the shared Tempo Map toggle while preserving EOF note-mode T for tap
• reuse one toggle function for the toolbar button and shortcut command

Validation

• node --check screen.js
• node tests\eof_shortcuts.test.js
• node tests\tempo_sync_inspector.test.js
• node tests\tempo_map_guidance.test.js
• node tests\tempo_map_bpm.test.js
• node tests\tempo_map_timesig.test.js
• node tests\measure_readout.test.js
• git diff --cached --check
• staged public-term guardrail scan

Summary by CodeRabbit

• New Features

  • Added a keyboard shortcut to enter or exit Tempo Map mode with T.
  • Tempo Map mode now updates consistently across keyboard and toolbar controls.

• Bug Fixes

  • Improved mode switching so Tempo Map and drum editing stay in sync.
  • Clearing and refreshing selections now happens automatically when switching modes.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 59416611-ffa6-4d56-a8e8-32b420d64cb7

📥 Commits

Reviewing files that changed from the base of the PR and between 888bee6 and 6282c5b.

📒 Files selected for processing (2)

• screen.js
• tests/eof_shortcuts.test.js

📝 Walkthrough

Walkthrough

Adds a "toggleTempoMap" editor shortcut bound to the "T" key, updates EOF and FeedBack keyboard dispatch and command execution to handle it, introduces a shared _editorToggleTempoMapMode() helper used by both the shortcut and toolbar button, and extends test assertions to cover the new mappings.

Changes

Toggle Tempo Map shortcut and mode helper

Layer / File(s)	Summary
Shortcut command and dispatch mapping screen.js	Adds toggleTempoMap to the shortcut command list with a T key label, and updates EOF and FeedBack shortcut dispatch so plain "t" maps to toggleTempoMap, including special handling when already in Tempo Map mode.
Execution wiring and toggle helper screen.js	Adds the toggleTempoMap case to the command execution switch, introduces _editorToggleTempoMapMode() to centralize toggling of S.tempoMapMode (finalizing drags, resetting selection/hover, excluding drum edit mode, refreshing controls, redrawing, updating status), and refactors the Tempo Map toolbar button to call this helper instead of duplicating logic.
Shortcut mapping test coverage tests/eof_shortcuts.test.js	Adds assertions verifying toggleTempoMap key labels ("T (Tempo Map)" for EOF, "T" for Feedback) and confirms "t" maps to toggleTempoMap across Feedback Native and EOF Tempo Map mode tests, including toggleTap behavior outside Tempo Map mode.

Estimated code review effort: 2 (Simple) | ~10 minutes

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant ShortcutDispatch
  participant CommandSwitch
  participant EditorToggleTempoMapMode

  User->>ShortcutDispatch: press "t"
  ShortcutDispatch->>CommandSwitch: toggleTempoMap
  CommandSwitch->>EditorToggleTempoMapMode: _editorToggleTempoMapMode()
  EditorToggleTempoMapMode->>EditorToggleTempoMapMode: finalize drag, toggle tempoMapMode, reset selection
  EditorToggleTempoMapMode->>User: refresh buttons, redraw, update status

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/editor-tempo-toggle-command

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