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/widgets/search/explore_grid.dart

@@ -59,7 +59,7 @@ class ExploreGrid extends StatelessWidget {
                     ),
                   )
                 : context.pushRoute(
-                    SearchInputRoute(
+                    SearchRoute(
                       prefilter: SearchFilter(
                         people: {},
                         location: SearchLocationFilter(

mobile/lib/widgets/search/search_filter/search_filter_chip.dart

@@ -48,7 +48,7 @@ class SearchFilterChip extends StatelessWidget {
       child: Card(
         elevation: 0,
         shape: StadiumBorder(
-          side: BorderSide(color: context.colorScheme.outline.withOpacity(.5)),
+          side: BorderSide(color: context.colorScheme.outline.withAlpha(15)),
         ),
         child: Padding(
           padding: const EdgeInsets.symmetric(vertical: 2.0, horizontal: 14.0),