🎨 Palette: Improve accessibility of ClassificationPreview action buttons

[thebearwithabite]

🎨 Palette UX/A11y Enhancement

This PR focuses on a micro-UX improvement for the ClassificationPreview component, specifically targeting screen reader and keyboard navigation accessibility.

💡 What:

• Added an aria-label="Skip organization" to the icon-only close (X) button.
• Added aria-hidden="true" to the decorative Lucide React icons within the action buttons (Loader2, Check, RefreshCw, X).
• Applied consistent focus-visible:ring-2 (and related outline/offset utilities) to all action buttons.
• Updated .jules/palette.md to document the learning.

🎯 Why:

• Screen Readers: Previously, the "Skip" button was just an X icon, meaning a screen reader would announce it unhelpfully as "button". Adding the aria-label provides necessary context. Adding aria-hidden to the SVG icons prevents the screen reader from trying to read out the SVG paths or duplicate the button's text label.
• Keyboard Navigation: While mouse users easily understand button bounds, keyboard users rely on focus states. The standard Tailwind classes didn't provide a strong enough visual indicator when tabbing through the ClassificationPreview modal. The focus-visible classes ensure a clear ring appears.

📸 Before/After:

• Visual changes are isolated to focus states. When tabbing to the Confirm, Reclassify, or Skip buttons, a clear white focus ring now appears.

♿ Accessibility:

• Improved semantics for screen reader users.
• Improved visual focus indicators for keyboard users.

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PR created automatically by Jules for task 7480254534820878181 started by @thebearwithabite

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