🎨 Palette: Inline Clipboard Feedback & Accessibility

[anaxifty]

I have implemented a micro-UX enhancement that provides consistent, accessible inline feedback for all clipboard "Copy" operations throughout the application.

Changes:

• CSS: Added a .copy-success class in style.css using the existing --ok token for brand-consistent success styling.
• Utilities: Introduced a centralized copyFeedback(btn, text) utility in js/utils.js that handles visual state, mutex protection (to prevent rapid-click glitches), and ARIA label synchronization.
• Integration:
  • Chat Messages: Assistant message "Copy" actions now show "Copied!" inline.
  • Code Blocks: The "Copy code" button in markdown blocks now provides visual confirmation.
  • Canvas/Artifacts: The copy button in the Canvas panel now provides inline feedback.
  • Share Modal: Updated the "Copy to Clipboard" button with feedback and added a 700ms delay before the modal closes, ensuring users perceive the success state.

Accessibility:

• Every copy action now dynamically updates the aria-label of the target button during the feedback cycle, ensuring screen reader users receive immediate confirmation of the successful copy operation.

Verification:

• Verified via a local Python server and Playwright script.
• Confirmed that button states revert correctly and icons are preserved during the feedback cycle.
• Syntax validated with node -c.

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PR created automatically by Jules for task 3301648436981492107 started by @anaxifty

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