fix(orders): Fix shipping rate recalculation and auto-selection

## Issues Fixed:

### 1. Shipping rates not recalculating when address changes ✅

**Problem:**
- Change province → Rates stay the same
- Query was cached incorrectly

**Root Cause:**
Query key only tracked country, state, postcode:
```ts
queryKey: [..., shippingData.country, shippingData.state, shippingData.postcode]
```

But Rajaongkir and other plugins also need:
- City (different rates per city)
- Address (for some plugins)

**Solution:**
```ts
queryKey: [
  ...,
  shippingData.country,
  shippingData.state,
  shippingData.city,      // Added
  shippingData.postcode,
  shippingData.address_1  // Added
],
staleTime: 0, // Always refetch when key changes
```

### 2. First rate auto-selected but dropdown shows placeholder ✅

**Problem:**
- Rates calculated → First rate used in total
- But dropdown shows "Select shipping"
- Confusing UX

**Solution:**
Added useEffect to auto-select first rate:
```ts
useEffect(() => {
  if (shippingRates?.methods?.length > 0) {
    const firstRateId = shippingRates.methods[0].id;
    const currentExists = shippingRates.methods.some(m => m.id === shippingMethod);

    // Auto-select if no selection or current not in new rates
    if (!shippingMethod || !currentExists) {
      setShippingMethod(firstRateId);
    }
  }
}, [shippingRates?.methods]);
```

## Benefits:
- ✅ Change province → Rates recalculate immediately
- ✅ First rate auto-selected in dropdown
- ✅ Selection cleared if no rates available
- ✅ Selection preserved if still valid after recalculation

## Testing:
1. Select Jakarta → Shows JNE rates
2. Change to Bali → Rates recalculate, first auto-selected
3. Change to remote area → Different rates, first auto-selected
4. Dropdown always shows current selection

admin-spa/src/routes/Orders/partials/OrderForm.tsx

@@ -187,7 +187,7 @@ export default function OrderForm({
 
   // Calculate shipping rates dynamically
   const { data: shippingRates, isLoading: shippingLoading } = useQuery({
-    queryKey: ['shipping-rates', items.map(i => ({ product_id: i.product_id, qty: i.qty })), shippingData.country, shippingData.postcode, shippingData.state],
+    queryKey: ['shipping-rates', items.map(i => ({ product_id: i.product_id, qty: i.qty })), shippingData.country, shippingData.state, shippingData.city, shippingData.postcode, shippingData.address_1],
     queryFn: async () => {
       if (!shippingData.country) return null;
       return api.post('/shipping/calculate', {
@@ -196,11 +196,12 @@ export default function OrderForm({
       });
     },
     enabled: !!shippingData.country && items.length > 0,
+    staleTime: 0, // Always refetch when query key changes
   });
 
   // Calculate order preview with taxes
   const { data: orderPreview, isLoading: previewLoading } = useQuery({
-    queryKey: ['order-preview', items.map(i => ({ product_id: i.product_id, qty: i.qty })), bCountry, bState, bPost, bCity, shippingData, shippingMethod, validatedCoupons.map(c => c.code)],
+    queryKey: ['order-preview', items.map(i => ({ product_id: i.product_id, qty: i.qty })), bCountry, bState, bPost, bCity, shippingData.country, shippingData.state, shippingData.city, shippingData.postcode, shippingMethod, validatedCoupons.map(c => c.code)],
     queryFn: async () => {
       if (items.length === 0) return null;
       return api.post('/orders/preview', {
@@ -212,6 +213,7 @@ export default function OrderForm({
       });
     },
     enabled: items.length > 0 && !!bCountry,
+    staleTime: 0, // Always refetch when query key changes
   });
 
   // --- Product search for Add Item ---
@@ -301,6 +303,21 @@ export default function OrderForm({
     setValidatedCoupons(validatedCoupons.filter(c => c.code !== code));
   };
 
+  // Auto-select first shipping rate when rates change
+  React.useEffect(() => {
+    if (shippingRates?.methods && shippingRates.methods.length > 0) {
+      const firstRateId = shippingRates.methods[0].id;
+      // Only auto-select if no method selected or current method not in new rates
+      const currentMethodExists = shippingRates.methods.some((m: any) => m.id === shippingMethod);
+      if (!shippingMethod || !currentMethodExists) {
+        setShippingMethod(firstRateId);
+      }
+    } else if (shippingRates?.methods && shippingRates.methods.length === 0) {
+      // Clear selection if no rates available
+      setShippingMethod('');
+    }
+  }, [shippingRates?.methods]);
+
   // Check if cart has physical products
   const hasPhysicalProduct = React.useMemo(
     () => items.some(item => {