Add editor-mode global keyboard playback hotkeys

[smcga]

Motivation

• Provide convenient keyboard controls in the Scene + Timeline Editor for faster playback iteration without interfering with form inputs or other page focus.

Description

• Add a small, testable editor hotkey mapper getEditorShortcutAction in src/controls.ts that maps Space → toggle-playback, ArrowLeft → seek-backward, and ArrowRight → seek-forward.
• Wire editor-only handling into the global keydown handler in src/main.ts so shortcuts run only when the editor is visible (editorController?.isVisible()) and shouldHandleGlobalShortcut allows (no focused editable target), call preventDefault() for handled keys, and broadcast actions via the existing playbackSync.
• Update editor docs in README.md to document the new hotkeys.

Testing

• Added unit tests for getEditorShortcutAction in src/controls.test.ts and ran npm test -- src/controls.test.ts, which passed (17 tests, all green).

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
codexperimental	Ready	Preview, Comment	Apr 28, 2026 11:00pm