🎨 Palette: Add keyboard and screen reader accessibility to scrollable output containers

[EffortlessSteven]

💡 What: Replaced <label> with styled <div> for non-form control scrollable text regions and added tabindex="0", role="region", and aria-labelledby to them.
🎯 Why: Scrollable containers (e.g. ones with overflow-y: auto) need to be keyboard focusable so that keyboard-only users can scroll through the text output. Furthermore, associating a label explicitly makes them properly perceivable for screen readers. <label> tags should strictly be for form elements.
📸 Before/After: N/A - Visuals are effectively unchanged.
♿ Accessibility: Improved keyboard accessibility and screen reader support for the WASM browser demo output regions.

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PR created automatically by Jules for task 12068300566754683886 started by @EffortlessSteven

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