🎨 Palette: Restore Cosmology Map Placeholder on Mouseleave/Blur

[ightevenmckane187]

🎨 Palette: Restore Cosmology Map Placeholder on Mouseleave/Blur

💡 What:

• Implemented a styled default visual placeholder .info-placeholder within #archetype-info container on the Sovereign Cypher-Tube homepage.
• Registered client-side mouseleave and blur event listeners on the Cosmology Map .archetype-node elements to gracefully restore the pristine default placeholder when mouse or focus shifts away.
• Expanded the server-side test suite tests/server.test.ts to assert presence of the placeholder and restoration callbacks.

🎯 Why:

• Prevents visual dead space or empty, hidden cards before user interaction.
• Informs and guides screen reader and visual users that the cosmology archetypes are interactive.
• Eliminates visual/accessibility stale text when interaction ends.

♿ Accessibility:

• Styled with high contrast and readable text style.
• Uses aria-live="polite" on #archetype-info so updates are accessible.
• Uses keyboard-navigable focus states that also trigger details.

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PR created automatically by Jules for task 8662535871702366838 started by @ightevenmckane187

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