🎨 Palette: Fix accessibility for icon-only and responsive buttons

[Bhishaj9]

💡 What:

Added explicit aria-label attributes to responsive buttons (where text is hidden on small screens) and icon-only buttons. Added aria-hidden="true" to their internal Material Symbol icons. Recorded this UX learning in .jules/palette.md.

🎯 Why:

Buttons or links using Tailwind's hidden lg:inline text classes lose their accessible names on small screens, causing screen readers to read nothing or the raw icon ligature (e.g., "rocket_launch"). Adding aria-label and aria-hidden ensures a consistent, accessible experience across all device sizes.

♿ Accessibility:

• Added aria-label to Deploy, Back to Home, Copy JSON, and Download JSON buttons.
• Hid raw icon ligatures from screen readers using aria-hidden="true".

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PR created automatically by Jules for task 8728788570244261969 started by @Bhishaj9

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