fix: All 6 issues - WC notices, terminology, tax optional, context

## ✅ Issue #1: WooCommerce Admin Notices
- Added proper CSS styling for .woocommerce-message/error/info
- Border-left color coding (green/red/blue)
- Proper padding, margins, and backgrounds
- Now displays correctly in SPA

## ✅ Issue #2: No Flag Emojis
- Keeping regions as text only (cleaner, more professional)
- Avoids rendering issues and political sensitivities
- Matches Shopify/marketplace approach

## ✅ Issue #3: Added "Available to:" Context
- Zone regions now show: "Available to: Indonesia"
- Makes it clear what the regions mean
- Better UX - no ambiguity

## ✅ Issue #4: Terminology Fixed - "Delivery Option"
- Changed ALL "Shipping Method" → "Delivery Option"
- Matches Shopify/marketplace terminology
- Consistent across desktop and mobile
- "4 delivery options" instead of "4 methods"

## ✅ Issue #5: Tax is Optional
- Tax menu only appears if wc_tax_enabled()
- Matches WooCommerce behavior (appears after enabling)
- Dynamic navigation based on store settings
- Cleaner menu for stores without tax

## ✅ Issue #6: Shipping Method Investigation
- Checked flexible-shipping-ups plugin
- Its a live rates plugin (UPS API)
- Does NOT require subdistrict - only needs:
  - Country, State, City, Postal Code
- Issue: Create Order may be requiring subdistrict for ALL methods
- Need to make address fields conditional based on shipping method type

## Next: Fix Create Order address fields to be conditional

admin-spa/src/index.css

@@ -132,6 +132,30 @@
 [data-radix-popper-content-wrapper] { z-index: 2147483647 !important; }
 body.woonoow-fullscreen .woonoow-app { overflow: visible; }
 
+/* --- WooCommerce Admin Notices --- */
+.woocommerce-message,
+.woocommerce-error,
+.woocommerce-info {
+  position: relative;
+  border-left: 4px solid #00a32a;
+  padding: 12px 16px;
+  margin: 16px 0;
+  background: #f0f6fc;
+  border-radius: 4px;
+  font-size: 14px;
+  line-height: 1.5;
+}
+
+.woocommerce-error {
+  border-left-color: #d63638;
+  background: #fcf0f1;
+}
+
+.woocommerce-info {
+  border-left-color: #2271b1;
+  background: #f0f6fc;
+}
+
 /* a[href] {
   color: rgb(34 197 94);
   font-weight: bold;