Finally Fixed search field in payment page and cleaned up payment flow

frontend/pweb/lib/pages/payment_methods/widgets/recipient_section.dart

@@ -45,25 +45,44 @@ class RecipientSection extends StatelessWidget {
       );
     }
 
-    return Column(
-      crossAxisAlignment: CrossAxisAlignment.start,
-      children: [
-        SectionTitle(loc.recipient),
-        SizedBox(height: dimensions.paddingSmall),
-        RecipientSearchField(
-          controller: searchController,
-          onChanged: onSearchChanged,
-          focusNode: searchFocusNode,
-        ),
-        if (recipientProvider.query.isNotEmpty) ...[
-          SizedBox(height: dimensions.paddingMedium),
-          RecipientSearchResults(
-            dimensions: dimensions,
-            recipientProvider: recipientProvider,
-            onRecipientSelected: onRecipientSelected,
-          ),
-        ],
-      ],
+    return AnimatedBuilder(
+      animation: recipientProvider,
+      builder: (context, _) {
+        final previousRecipient = recipientProvider.previousRecipient;
+        final hasQuery = recipientProvider.query.isNotEmpty;
+
+        return Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            SectionTitle(loc.recipient),
+            SizedBox(height: dimensions.paddingSmall),
+            RecipientSearchField(
+              controller: searchController,
+              onChanged: onSearchChanged,
+              focusNode: searchFocusNode,
+            ),
+            if (previousRecipient != null) ...[
+              SizedBox(height: dimensions.paddingSmall),
+              ListTile(
+                dense: true,
+                contentPadding: EdgeInsets.zero,
+                leading: const Icon(Icons.undo),
+                title: Text(loc.back),
+                subtitle: Text(previousRecipient.name),
+                onTap: () => onRecipientSelected(previousRecipient),
+              ),
+            ],
+            if (hasQuery) ...[
+              SizedBox(height: dimensions.paddingMedium),
+              RecipientSearchResults(
+                dimensions: dimensions,
+                recipientProvider: recipientProvider,
+                onRecipientSelected: onRecipientSelected,
+              ),
+            ],
+          ],
+        );
+      },
     );
   }
-}
+}