[P1] Dialog: Close button removes focus indicator

[sujaypawar]

Summary

Dialog close button removes focus indicator - keyboard users can't see focus.

Severity: P1 (High)
WCAG: 2.4.7 Focus Visible (Level AA)
Component: Dialog
File: src/components/dialog/dialog.tsx:382

Issue

Close button uses focus:outline-none with no replacement focus style.

Fix (5 min - Quick Win)

// Replace line 382:
'focus:outline-none focus:ring-2 focus:ring-border-focus focus:ring-offset-2 rounded'

Testing

• Update focus styles
• Tab to close button - focus visible
• Test contrast: 3:1 minimum
• Verify across browsers

Related: #369
Quick Win: Yes
Priority: P1