🎨 Palette: Add focus-visible styles to Captain Dashboard buttons

[dhaatrik]

💡 What: Added explicit focus-visible styles to all primary and secondary call-to-action buttons in the CaptainDashboard component.
🎯 Why: To improve accessibility for keyboard users. The brutalist design system often obscures default browser focus rings, making it difficult to navigate interactively.
📸 Before/After: N/A (Visual change only apparent when navigating with a keyboard; screenshots provided in verification step demonstrate no visual regressions in normal state).
♿ Accessibility: Enhanced keyboard navigation by providing a clear, visible focus ring (ring-2 ring-primary) with an offset when buttons are focused via keyboard.

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PR created automatically by Jules for task 11179818478010278614 started by @DhaatuTheGamer

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