Fixed two critical issues with VerticalTabForm:
Issue #1: All sections showing at once
- Problem: className override was removing original classes
- Fix: Preserve originalClassName and append 'hidden' when inactive
- Now only active section is visible
- Inactive sections get 'hidden' class added
Issue #2: No horizontal tabs on mobile
- Added mobile horizontal tabs (lg:hidden)
- Scrollable tab bar with overflow-x-auto
- Active tab highlighted with bg-primary
- Icons + labels for each tab
- Separate mobile content area
Changes to VerticalTabForm.tsx:
1. Fixed className merging logic
- Get originalClassName from child.props
- Active: use originalClassName as-is
- Inactive: append ' hidden' to originalClassName
- Prevents className override issue
2. Added mobile layout
- Horizontal tabs at top (lg:hidden)
- Flex with gap-2, overflow-x-auto
- flex-shrink-0 prevents tab squishing
- Active state: bg-primary text-primary-foreground
- Inactive state: bg-muted text-muted-foreground
3. Desktop layout (hidden lg:flex)
- Vertical sidebar (w-56)
- Content area (flex-1)
- Scroll spy for desktop only
4. Mobile content area (lg:hidden)
- No scroll spy (simpler)
- Direct tab switching
- Same visibility logic (hidden class)
Result:
✅ Only active section visible (desktop + mobile)
✅ Mobile has horizontal tabs
✅ Desktop has vertical sidebar
✅ Proper responsive behavior
✅ Tab switching works correctly
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