Key bug fix:
- Key sprite position was never set on startup, appearing at (0,0)
- Added init-key-position! called in start-drawing! to place key sprite
at its grid position on load
Arcade UI polish:
- Header bar with "PAC-MAN" title in yellow
- "SCORE" label above score value in header
- Sidebar separator uses wall color instead of white block
- "TIME" label with large countdown in sidebar area
- Coins now rendered as small centered dots (coin-size constant)
- Arcade color palette: #2121DE walls, #FFB851 coins, #FFB8FF doors
- "GAME OVER" overlay in red when time expires
- "PAUSED" overlay covers maze area only (not header)
- Window title set to "PAC-MAN"
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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