🎨 Palette: Improve Voting Button Accessibility

[WeixuanZ]

🎨 Palette: Improve Voting Button Accessibility\n\n💡 What: Added type="button" and aria-pressed attributes to the player selection buttons in VotingPanel.tsx.\n\n🎯 Why: Standard HTML buttons used in selection grids often lack semantic state indicators. Screen reader users would hear "Button, PlayerName" but would not know if the player was selected or not. The visual cue (border/background) was inaccessible.\n\n♿ Accessibility:\n- type="button": Good practice for non-submit buttons.\n- aria-pressed: Explicitly communicates the toggle/selection state (Pressed/Not Pressed) to assistive technologies.\n\nJournal Entry: Added critical learning about aria-pressed to .Jules/palette.md.

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PR created automatically by Jules for task 12994430813000652407 started by @WeixuanZ

[google-labs-jules]

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