🎨 Palette: Add "Copy to Clipboard" utility to OS*2 code blocks

[rtech-technologies]

I have implemented a new "Copy to Clipboard" utility for the code blocks on the OS*2 specifications page (os2.html).

✨ Features:

• Contextual UI: The Copy button is hidden by default to maintain the clean terminal aesthetic and only appears when the user hovers over the code block or focuses it via keyboard.
• Visual Feedback: Upon clicking, the button text changes to "Copied!" and the background swaps to the RTECH signature Lime-500 color for 2 seconds, providing clear and satisfying confirmation.
• Accessibility: Added aria-label="Copy code to clipboard" and ensured the button is visible on focus for keyboard-only users.
• Robustness: The script uses the modern navigator.clipboard API with a fallback to document.execCommand('copy') to ensure it works across all environments.

♿ Accessibility Improvements:

• Added ARIA labels to the new interactive element.
• Ensured focus indicators and visibility for keyboard navigation.

📸 Verification:

• Verified with a Playwright script that simulates hover, click, and the timed revert state.
• Visual confirmation via screenshot shows the button integrates perfectly with the RTECH industrial design system.

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PR created automatically by Jules for task 7085948384432023482 started by @rtech-technologies

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