🎨 Palette: Improve Player List Accessibility

[WeixuanZ]

💡 What: Added aria-label to the icon-only "Kick" button and role="status" + aria-label to the online/offline status dot in PlayerList.tsx.
🎯 Why: Screen reader users could not identify the kick button or the player's online status.
♿ Accessibility: Icon-only buttons now have text alternatives. Status indicators are now semantically exposed.
Journal: Updated .Jules/palette.md with learnings about icon buttons and status indicators.

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PR created automatically by Jules for task 2816074602464722170 started by @WeixuanZ

[google-labs-jules]

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