🎨 Palette: Cloud Library Modal Accessibility

[ford442]

💡 What: Added standard ARIA modal attributes (role="dialog", aria-modal="true", aria-labelledby, tabIndex={-1}) to the CloudLibrary modal component. Also added an aria-hidden="true" to the clickable backdrop.

🎯 Why: To standardize modal accessibility across the app, ensuring screen readers announce the CloudLibrary correctly as a dialog with an accessible name, and preventing them from reading the empty clickable background area.

📸 Before/After: Visuals remain identical (as intended), but under the hood, the modal is now properly semantic.

♿ Accessibility:

• Added role="dialog", aria-modal="true", tabIndex={-1}
• Added an invisible <h2> for aria-labelledby
• Separated the clickable backdrop into its own aria-hidden="true" div.

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PR created automatically by Jules for task 5066101433088462225 started by @ford442

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