fix(integrations): cache shop info in sessionStorage for page refresh

Shop info (email, owner name) now persists across page refreshes using
sessionStorage. Falls back to cached data when server returns 404/expired.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

shopcall.ai-main/src/pages/IntegrationsRedirect.tsx

@@ -197,6 +197,19 @@ export default function IntegrationsRedirect() {
         });
 
         // Fetch shop info for auto-registration feature
+        // First check if we have cached shop info in sessionStorage
+        const cachedShopInfo = sessionStorage.getItem(`shop_info_${srInstall}`);
+        if (cachedShopInfo) {
+          try {
+            const parsed = JSON.parse(cachedShopInfo);
+            setShopInfo(parsed);
+            console.log('[ShopRenter] Shop info loaded from cache:', parsed);
+          } catch (e) {
+            console.warn('[ShopRenter] Failed to parse cached shop info');
+          }
+        }
+
+        // Always try to fetch fresh data from server
         setLoadingShopInfo(true);
         try {
           const infoResponse = await fetch(`${API_URL}/get-pending-install-info`, {
@@ -210,18 +223,25 @@ export default function IntegrationsRedirect() {
           if (infoResponse.ok) {
             const shopInfoData = await infoResponse.json();
             if (shopInfoData.success) {
-              setShopInfo({
+              const info = {
                 shop_email: shopInfoData.shop_email,
                 shop_owner_name: shopInfoData.shop_owner_name,
                 email_exists: shopInfoData.email_exists
-              });
+              };
+              setShopInfo(info);
+              // Cache in sessionStorage for page refreshes
+              sessionStorage.setItem(`shop_info_${srInstall}`, JSON.stringify(info));
               console.log('[ShopRenter] Shop info fetched:', shopInfoData);
             }
           } else {
-            console.warn('[ShopRenter] Failed to fetch shop info');
+            // If server returns error but we have cached data, keep using it
+            if (!cachedShopInfo) {
+              console.warn('[ShopRenter] Failed to fetch shop info and no cache available');
+            }
           }
         } catch (infoErr) {
           console.error('[ShopRenter] Error fetching shop info:', infoErr);
+          // Keep using cached data if available
         } finally {
           setLoadingShopInfo(false);
         }