🎨 Palette: Make OSINT modal triggers accessible to keyboard users

[0m364]

💡 What: The "OSINT" links that trigger a modal have been updated to act more like native buttons. They now have role="button" and aria-haspopup="dialog" attributes, and a keydown event listener was added to modal.js to respond to the Spacebar key.
🎯 Why: Previously, these triggers were standard anchor (<a>) tags with href="#". When users navigating via keyboard attempted to activate them using the Spacebar (the standard key for buttons), the page would scroll down instead of opening the modal. Screen readers also announced them as links instead of buttons that open dialogs.
📸 Before/After: N/A (Visual appearance is unchanged, behavioral difference only).
♿ Accessibility:

• Added role="button" to inform assistive tech that the link behaves as a button.
• Added aria-haspopup="dialog" to set expectations that a modal will appear.
• Bound Spacebar and Space keydown events to openModal, calling e.preventDefault() to stop unwanted page scrolling and providing true feature parity with native <button> elements.

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PR created automatically by Jules for task 2092491123866685564 started by @0m364

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