Add ?country=SA query param override for geo-pricing testing

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/js/main.js

@@ -81,12 +81,17 @@ document.addEventListener('DOMContentLoaded', () => {
   injectRevealStyles();
   injectDynamicStyles();
 
-  // Detect country and apply geo-pricing
+  // Detect country and apply geo-pricing (?country=SA override for testing)
+  const urlCountry = new URLSearchParams(window.location.search).get('country');
+  if (urlCountry) {
+    applyGeoPricing(urlCountry.toUpperCase());
+  } else {
     detectCountry().then(country => {
       if (country !== 'EG') {
         applyGeoPricing(country);
       }
     });
+  }
 });
 
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