🎨 Palette: Improve accessibility of dynamic output regions

[EffortlessSteven]

💡 What:
Replaced invalid <label> tags with styled <div> elements linked via aria-labelledby for scrollable, non-interactive output containers (<div class="output"> and <div class="streaming-output">). Added tabindex="0", role="region", and aria-live="polite" to the containers.

🎯 Why:
<label> elements are strictly meant for form controls. Using them to label generic <div> containers violates HTML semantics and causes screen reader issues. Additionally, dynamic AI output regions were not marked as live regions, meaning screen readers wouldn't announce generated text updates. Adding tabindex="0" ensures keyboard users can scroll through long output blocks.

📸 Before/After:
Before: Output regions were visually labeled with <label> but lacked keyboard focusability, proper semantic labeling, and live region updates.
After: Output regions use semantically correct ARIA labels, are keyboard accessible, and announce content updates via aria-live="polite".

♿ Accessibility:

• Replaced <label> with <div id="..."> + aria-labelledby
• Added role="region" for landmark identification
• Added tabindex="0" for keyboard scrolling
• Added aria-live="polite" to announce dynamically generated text (Streaming, Web Worker, Benchmark results)

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PR created automatically by Jules for task 8884309839445239076 started by @EffortlessSteven

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