chore(mobile): search page minor enhancements (#13403)

* chore(mobile): search page retouched

* add placeholder photos

* remove unused page

* focus the search input when tapping on the search controller button

* detail fixed

* remove print statements

* disable scrolling of empty content

mobile/lib/pages/library/library.page.dart

@@ -108,6 +108,7 @@ class QuickAccessButtons extends ConsumerWidget {
           colors: [
             context.colorScheme.primary.withAlpha(10),
             context.colorScheme.primary.withAlpha(15),
+            context.colorScheme.primary.withAlpha(20),
           ],
           begin: Alignment.topCenter,
           end: Alignment.bottomCenter,