## Error 1: Tax Settings - Empty SelectItem value ✅
**Issue:** Radix UI Select does not allow empty string as SelectItem value
**Error:** "A <Select.Item /> must have a value prop that is not an empty string"
**Solution:**
- Use 'standard' instead of empty string for UI
- Convert 'standard' → '' when submitting to API
- Initialize selectedTaxClass to 'standard'
- Update all dialog handlers to use 'standard'
## Error 2: OrderForm - Undefined shipping variables ✅
**Issue:** Removed individual shipping state variables (sFirst, sLast, sCountry, etc.) but forgot to update all references
**Error:** "Cannot find name 'sCountry'"
**Solution:**
Fixed all remaining references:
1. **useEffect for country sync:** `setSCountry(bCountry)` → `setShippingData({...shippingData, country: bCountry})`
2. **useEffect for state validation:** `sState && !states[sCountry]` → `shippingData.state && !states[shippingData.country]`
3. **Customer autofill:** Individual setters → `setShippingData({ first_name, last_name, ... })`
4. **Removed sStateOptions:** No longer needed with dynamic fields
## Testing:
- ✅ Tax settings page loads without errors
- ✅ Add/Edit tax rate dialog works
- ✅ OrderForm loads without errors
- ✅ Shipping fields render dynamically
- ✅ Customer autofill works with new state structure
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