fix(mobile): fix text search (#14873)

* fix(mobile): fix text search

* chore(mobile): add tests for SearchPage

* fix(mobile): fix render overflow for small screens

Needed for SearchPage test to not throw overflow error

* chore(mobile): update import_rule_openapi

* styling

* preserve styling and skip a test

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/pages/search/search.page.dart

@@ -441,19 +441,15 @@ class SearchPage extends HookConsumerWidget {
     }
 
     handleTextSubmitted(String value) {
-      if (value.isEmpty) {
-        return;
-      }
-
       if (isContextualSearch.value) {
         filter.value = filter.value.copyWith(
-          filename: null,
+          filename: '',
           context: value,
         );
       } else {
         filter.value = filter.value.copyWith(
           filename: value,
-          context: null,
+          context: '',
         );
       }
 
@@ -468,6 +464,7 @@ class SearchPage extends HookConsumerWidget {
           Padding(
             padding: const EdgeInsets.only(right: 14.0),
             child: IconButton(
+              key: const Key('contextual_search_button'),
               icon: isContextualSearch.value
                   ? const Icon(Icons.abc_rounded)
                   : const Icon(Icons.image_search_rounded),
@@ -496,6 +493,7 @@ class SearchPage extends HookConsumerWidget {
             ),
           ),
           child: TextField(
+            key: const Key('search_text_field'),
             controller: textSearchController,
             decoration: InputDecoration(
               contentPadding: prefilter != null
@@ -551,6 +549,7 @@ class SearchPage extends HookConsumerWidget {
             child: SizedBox(
               height: 50,
               child: ListView(
+                key: const Key('search_filter_chip_list'),
                 shrinkWrap: true,
                 scrollDirection: Axis.horizontal,
                 padding: const EdgeInsets.symmetric(horizontal: 16),
@@ -580,6 +579,7 @@ class SearchPage extends HookConsumerWidget {
                     currentFilter: dateRangeCurrentFilterWidget.value,
                   ),
                   SearchFilterChip(
+                    key: const Key('media_type_chip'),
                     icon: Icons.video_collection_outlined,
                     onTap: showMediaTypePicker,
                     label: 'search_filter_media_type'.tr(),