🎨 Palette: [UX improvement] - Accessible Modal Triggers (Spacebar Support)

[0m364]

💡 What:
Added role="button" and aria-haspopup="dialog" to the #sitrep-btn anchor tags across concepts.html, contact.html, and products.html. Also updated modal.js to listen for the Spacebar key on these elements, preventing the default scroll behavior and opening the modal.

🎯 Why:
When using <a> tags with href="#" to open modals, they lack the correct semantic button meaning for screen readers. Furthermore, while native anchors trigger on Enter, screen readers and keyboard users expect buttons to respond to both Enter and Spacebar. Without this fix, pressing Spacebar on the OSINT links simply scrolls the page down, which is a frustrating experience.

📸 Before/After:
(Visuals remain unchanged, but interaction is improved)

• Before: Screen readers announce "OSINT, link". Pressing Spacebar scrolls the page down.
• After: Screen readers announce "OSINT, button, opens dialog". Pressing Spacebar correctly opens the modal without scrolling.

♿ Accessibility:

• Added role="button" and aria-haspopup="dialog".
• Added JavaScript keydown listener to handle Spacebar navigation for non-native button elements.
• Logged critical learning in .Jules/palette.md.

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PR created automatically by Jules for task 13690390877261174214 started by @0m364

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