Comprehensive macOS HIG compliance sweep

[datlechin]

Summary

Full macOS Human Interface Guidelines compliance sweep across 67 files, covering 5 categories:

1. System semantic colors (~46 instances, 30 files)

• Replace .foregroundStyle(.red/.green/.orange/.yellow/.blue/.purple) with Color(nsColor: .systemRed) etc.
• Replace Color.white with Color(nsColor: .alternateSelectedControlTextColor) in VimModeIndicatorView
• Ensures proper adaptation to high-contrast mode and dark mode

2. Accessibility labels + hit targets + popover escape (~20 instances, 15 files)

• Add .accessibilityLabel(String(localized:)) to 15 icon-only buttons (font steppers, trash, clear, dismiss)
• Add .frame(width: 24, height: 24) to 4 buttons with inadequate hit targets
• Add .onExitCommand to SafeModeBadgeView and PaginationControlsView popovers
• Refactor ResultTabBar: replace .onTapGesture with Button for keyboard/VoiceOver support

3. Font sizes → theme tokens (53 instances, 23 files)

• Replace hardcoded .font(.system(size: 10/11/12/13/15)) with ThemeEngine.shared.activeTheme.typography.*

4. Corner radius → theme tokens (32 instances, 19 files)

• Fix 3 deprecated .cornerRadius() → .clipShape(RoundedRectangle(...))
• Replace 29 hardcoded cornerRadius: 4/6/8 with theme cornerRadius.small/medium/large

5. Localize strings (30 instances, 12 files)

• Wrap 27 .help("...") tooltips with String(localized:)
• Wrap 3 .alert("...")/TextField("...") strings

Test plan

• Build succeeds
• Toggle System Preferences > Accessibility > Display > Increase Contrast — verify status colors adapt
• Enable VoiceOver (Cmd+F5) — navigate icon buttons, verify labels are announced
• Open safe mode popover → press Escape → verify it dismisses
• Open pagination settings popover → press Escape → verify it dismisses
• Check result tab bar — verify tabs are clickable and keyboard-navigable
• Visual spot-check: Import/Export dialogs, connection forms, sidebar, settings