🎨 Palette: Add keyboard accessibility and ARIA roles to OSINT modal triggers

[0m364]

💡 What: Added role="button" and aria-haspopup="dialog" to the anchor tags (#sitrep-btn) used to open the OSINT modal. Updated modal.js to listen for the Spacebar keypress to trigger the modal and prevent default page scrolling.

🎯 Why: Using <a> tags (with href="#") to trigger modals without native button semantics creates a poor experience for screen readers and keyboard users. Native anchors only trigger on Enter, whereas users expect buttons to respond to Spacebar as well. Without proper ARIA roles, assistive tech reads them as simple links instead of dialog triggers.

📸 Before/After: Visually identical, but functionally accessible via keyboard (Spacebar).

♿ Accessibility: Screen readers now correctly identify the links as buttons that open a dialog. Keyboard users can now use both Enter (native) and Spacebar (custom listener) to interact with the triggers as expected of interactive buttons. Recorded this learning pattern in .Jules/palette.md.

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PR created automatically by Jules for task 8748266971196831645 started by @0m364

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