fix(questions-list): handle optional tips sheet in hardware back stack cleanly

src/app/questions-list/questions-list-client.tsx

@@ -63,15 +63,14 @@ export default function QuestionsListClient() {
   // entries. Flutter calls __habibHandleHardwareBack() and we return false
   // (meaning "I didn't handle it — you should close").
   useHardwareBackHandler(() => {
+    if (isOptionalInfoSheetOpen) {
+      setIsOptionalInfoSheetOpen(false);
+      return true; // Handled: closed the tips sheet
+    }
     if (activeSectionSlug) {
       handleCloseSection();
       return true; // Handled: closed the section sheet, do not close WebView
     }
-    if (typeof window !== "undefined" && (window as any).HabibApp?.postMessage) {
-      (window as any).HabibApp.postMessage(
-        JSON.stringify({ action: "close_service" }),
-      );
-    }
     return false; // Tell Flutter to close the WebView screen
   });
   const { dictionary: t, locale } = useI18n();

src/components/Componentes/information-sheet.tsx

@@ -172,7 +172,10 @@ export function InformationSheet({
     }, EXIT_ANIMATION_MS);
   }, [isClosing, onClose]);
 
-  useHardwareBackHandler(closeSheet, isVisible && !isClosing);
+  useHardwareBackHandler(() => {
+    closeSheet();
+    return true;
+  }, isVisible && !isClosing);
 
   const controls = { close: closeSheet };
   const resolvedTitle = typeof title === "function" ? title(controls) : title;