opt: bottomnav/searchbar stream debounce

Closes #590

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/main/controller.dart

@@ -213,4 +213,10 @@ class MainController extends GetxController {
             })
         .toList();
   }
+
+  @override
+  void onClose() {
+    bottomBarStream.close();
+    super.onClose();
+  }
 }