🎨 Palette: Make SITREP modal triggers accessible via Spacebar

[0m364]

💡 What: Added role="button" and aria-haspopup="dialog" to the OSINT modal trigger anchors. Also updated modal.js to bind a Spacebar keydown event that opens the modal.
🎯 Why: Native <a> tags only trigger on the Enter key. Keyboard users and screen readers expect elements acting as buttons to also trigger on the Space key.
📸 Before/After: No visual changes, purely accessibility and interaction improvements.
♿ Accessibility: Screen readers will now announce the OSINT links as buttons that open a dialog. Keyboard users can now open the modal using the Spacebar.

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PR created automatically by Jules for task 17204993255363919429 started by @0m364

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