🎨 Palette: Global button focus visibility

[SillyHippy]

💡 What: Added focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-blue-500 focus-visible:ring-offset-2 directly to .ui-btn-primary and .ui-btn-secondary global utility classes in app/globals.css. Removed redundant focus classes from components/ui/footer.tsx.
🎯 Why: Previously, buttons using these utility classes lacked keyboard focus visibility unless it was explicitly added per-instance. This caused inconsistent accessibility, with some buttons (like in the navbar) missing focus rings entirely. Baking it into the global utility ensures every button using it is accessible by default.
📸 Before/After: See the attached visual verification screenshot.
♿ Accessibility: Guarantees keyboard navigators will always have a visible focus indicator when tabbing through action buttons using these standard utility classes.

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PR created automatically by Jules for task 11376043093237191673 started by @SillyHippy

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