Add keyboard-shortcut help overlay

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Press '?' to open a styled overlay showing all keyboard shortcuts,
Esc to close. Lists Space (play/pause), arrow keys (seek/volume),
F (fullscreen), M (mute), ? (help), Esc (close).

Files:
- frontend/app.js: toggleShortcutHelp(), wireShortcutHelp(), '?' and Esc handlers
- frontend/index.html: shortcut-overlay markup with .shortcut-grid
- frontend/styles.css: .shortcut-overlay, .shortcut-panel, .shortcut-row, kbd styles

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This commit is contained in:

Jonathan Sykes

2026-06-14 14:19:42 +08:00

parent da2ad27244

commit c676786144

7 changed files with 108 additions and 2 deletions

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