fix(checkout): fix disabled country/state and add public countries API

Issues fixed:
1. Country field was disabled when API failed (length 0)
   - Changed: disabled={countries.length <= 1} → disabled={countries.length === 1}
   - Only disables in single-country mode now

2. State field was disabled when no preloaded states
   - Changed: Falls back to text input instead of disabled SearchableSelect
   - Allows manual state entry for countries without state list

3. /countries API required admin permission
   - Added public /countries endpoint to CheckoutController
   - Uses permission_callback __return_true for customer checkout access
   - Returns countries, states, and default_country

customer-spa/src/pages/Checkout/index.tsx

@@ -628,18 +628,27 @@ export default function Checkout() {
                             value={billingData.country}
                             onChange={(v) => setBillingData({ ...billingData, country: v })}
                             placeholder="Select country"
-                            disabled={countries.length <= 1}
+                            disabled={countries.length === 1}
                           />
                         </div>
                         <div>
                           <label className="block text-sm font-medium mb-2">State / Province *</label>
-                          <SearchableSelect
+                          {billingStateOptions.length > 0 ? (
-                            options={billingStateOptions}
+                            <SearchableSelect
-                            value={billingData.state}
+                              options={billingStateOptions}
-                            onChange={(v) => setBillingData({ ...billingData, state: v })}
+                              value={billingData.state}
-                            placeholder={billingStateOptions.length ? "Select state" : "N/A"}
+                              onChange={(v) => setBillingData({ ...billingData, state: v })}
-                            disabled={!billingStateOptions.length}
+                              placeholder="Select state"
-                          />
+                            />
+                          ) : (
+                            <input
+                              type="text"
+                              value={billingData.state}
+                              onChange={(e) => setBillingData({ ...billingData, state: e.target.value })}
+                              placeholder="Enter state/province"
+                              className="w-full border rounded-lg px-4 py-2"
+                            />
+                          )}
                         </div>
                         <div>
                           <label className="block text-sm font-medium mb-2">Postcode / ZIP *</label>
@@ -801,18 +810,27 @@ export default function Checkout() {
                               value={shippingData.country}
                               onChange={(v) => setShippingData({ ...shippingData, country: v })}
                               placeholder="Select country"
-                              disabled={countries.length <= 1}
+                              disabled={countries.length === 1}
                             />
                           </div>
                           <div>
                             <label className="block text-sm font-medium mb-2">State / Province *</label>
-                            <SearchableSelect
+                            {shippingStateOptions.length > 0 ? (
-                              options={shippingStateOptions}
+                              <SearchableSelect
-                              value={shippingData.state}
+                                options={shippingStateOptions}
-                              onChange={(v) => setShippingData({ ...shippingData, state: v })}
+                                value={shippingData.state}
-                              placeholder={shippingStateOptions.length ? "Select state" : "N/A"}
+                                onChange={(v) => setShippingData({ ...shippingData, state: v })}
-                              disabled={!shippingStateOptions.length}
+                                placeholder="Select state"
-                            />
+                              />
+                            ) : (
+                              <input
+                                type="text"
+                                value={shippingData.state}
+                                onChange={(e) => setShippingData({ ...shippingData, state: e.target.value })}
+                                placeholder="Enter state/province"
+                                className="w-full border rounded-lg px-4 py-2"
+                              />
+                            )}
                           </div>
                           <div>
                             <label className="block text-sm font-medium mb-2">Postcode / ZIP *</label>

includes/Api/CheckoutController.php

@@ -32,6 +32,12 @@ class CheckoutController {
             'callback' => [ new self(), 'get_fields' ],
             'permission_callback' => [ \WooNooW\Api\Permissions::class, 'anon_or_wp_nonce' ],
         ]);
+        // Public countries endpoint for customer checkout form
+        register_rest_route($namespace, '/countries', [
+            'methods'  => 'GET',
+            'callback' => [ new self(), 'get_countries' ],
+            'permission_callback' => '__return_true', // Public - needed for checkout
+        ]);
         // Public order view endpoint for thank you page
         register_rest_route($namespace, '/checkout/order/(?P<id>\d+)', [
             'methods'  => 'GET',
@@ -729,4 +735,42 @@ class CheckoutController {
         }
         return null;
     }
+
+    /**
+     * Get countries and states for checkout form
+     * Public endpoint - no authentication required
+     */
+    public function get_countries(): array {
+        $wc_countries = WC()->countries;
+        
+        // Get allowed selling countries
+        $allowed = $wc_countries->get_allowed_countries();
+        
+        // Format for frontend
+        $countries = [];
+        foreach ($allowed as $code => $name) {
+            $countries[] = [
+                'code' => $code,
+                'name' => $name,
+            ];
+        }
+        
+        // Get states for all allowed countries
+        $states = [];
+        foreach (array_keys($allowed) as $country_code) {
+            $country_states = $wc_countries->get_states($country_code);
+            if (!empty($country_states) && is_array($country_states)) {
+                $states[$country_code] = $country_states;
+            }
+        }
+        
+        // Get default country
+        $default_country = $wc_countries->get_base_country();
+        
+        return [
+            'countries' => $countries,
+            'states' => $states,
+            'default_country' => $default_country,
+        ];
+    }
 }