🎨 Palette: Improve accessibility of OSINT modal triggers

[0m364]

💡 What: Added role="button" and aria-haspopup="dialog" to the #sitrep-btn "OSINT" modal trigger links across the site (products.html, concepts.html, contact.html). Added a keydown event listener in modal.js so that pressing the Spacebar triggers the modal.

🎯 Why: The OSINT triggers were implemented as standard <a> tags with href="#". Screen readers would announce them as navigation links rather than actionable buttons, and keyboard users could not trigger them using the Spacebar (which would default to scrolling the page). This change aligns the markup and behavior with user expectations for dialog triggers.

📸 Before/After: Visual appearance remains identical, but keyboard interactions (Spacebar) now function correctly.

♿ Accessibility: Ensures that elements acting as buttons are semantically announced as buttons (role="button") and explicitly indicate they open a dialog (aria-haspopup="dialog"). Also guarantees native button-like keyboard interactions (Enter and Space).

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PR created automatically by Jules for task 4991332482287143075 started by @0m364

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