🎨 Palette: Make scrollable output areas keyboard accessible

[EffortlessSteven]

💡 What: Replaced improper <label> tags with styled <div> elements and linked them via aria-labelledby to their corresponding scrollable output areas. Added tabindex="0" and role="region" to the output areas to make them keyboard focusable.
🎯 Why: The scrollable output areas were inaccessible to keyboard-only users and screen readers. Also, <label> tags should only be used for actual form controls, not generic <div> containers.
📸 Before/After: Before, <label> tags were inappropriately styling text, and the boxes were unreachable via the keyboard. After, the output areas can be focused, scrolled via keyboard arrows, and read appropriately by screen readers.
♿ Accessibility: Added aria-labelledby, role="region", and tabindex="0" to output areas, fixing improper labeling and missing focus management for scrollable regions.

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PR created automatically by Jules for task 15284647474968336920 started by @EffortlessSteven

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