fix some visual issues

lib/views/hashtag/hashtag.dart

@@ -42,7 +42,7 @@ class _HashtagState extends State<Hashtag> {
           builder: (context, state, child) => SliverStateHandler<HashtagState>(
             emptyState: const EmptyList(),
             enableEmptyState: state.items.isEmpty,
-            itemPadding: const EdgeInsets.only(bottom: 8),
+            itemPadding: const EdgeInsets.symmetric(vertical: 8.0),
             state: state,
             placeholder: RadarOverview.placeholder,
             builder: (context, state, index) {

lib/views/home/infography/infography_screen.dart

@@ -180,7 +180,7 @@ class _InfographyScreenState extends State<InfographyScreen> {
                 children: [
                   placeholder,
                   const SizedBox(
-                    height: 4,
+                    height: 8.0,
                   ),
                   placeholder
                 ],
@@ -191,13 +191,16 @@ class _InfographyScreenState extends State<InfographyScreen> {
             ),
             enableEmptyState:
                 context.watch<InfographyScreenState>().contents.isEmpty,
-            topPadding: 16,
+            topPadding: 16.0,
             onRetry: context.read<InfographyScreenState>().init,
             state: context.watch<InfographyScreenState>(),
             builder: (context, state) => Expanded(
-              child: ListView.builder(
+              child: ListView.separated(
                 controller: _scrollController,
                 itemCount: state.contents.length,
+                padding: const EdgeInsets.symmetric(vertical: 8.0),
+                separatorBuilder: (BuildContext context, i) =>
+                    const SizedBox(height: 8.0),
                 itemBuilder: (context, index) => InfographyItem(
                   id: state.contents[index].id,
                   onMarkChanged: (id, value, _) => state.changeMark(id, value),
@@ -217,7 +220,6 @@ class _InfographyScreenState extends State<InfographyScreen> {
   }
 
   static Widget get placeholder => const DidvanCard(
-        margin: EdgeInsets.all(8),
         padding: EdgeInsets.all(8),
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,

lib/views/home/main/widgets/infography_item.dart

@@ -96,7 +96,6 @@ class InfographyItem extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return DidvanCard(
-      margin: const EdgeInsets.all(12),
       padding: const EdgeInsets.all(12),
       child: Column(
         children: [

lib/views/podcasts/podcasts.dart

@@ -240,7 +240,7 @@ class _PodcastsState extends State<Podcasts> {
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             ItemTitle(
-              title: 'تاریخ رادار',
+              title: 'تاریخ ایجاد',
               style: Theme.of(context).textTheme.bodyMedium,
               icon: DidvanIcons.calendar_range_regular,
             ),

lib/views/podcasts/studio_details/widgets/studio_details_widget.dart

@@ -142,7 +142,9 @@ class StudioDetailsWidget extends StatelessWidget {
                           ),
                         );
                       }
-                      return Column(
+                      return Padding(
+                        padding: const EdgeInsets.only(top: 24.0),
+                        child: Column(
                           children: [
                             if (state.studio.relatedContents.isEmpty &&
                                 !state.studio.relatedContentsIsEmpty)
@@ -170,6 +172,7 @@ class StudioDetailsWidget extends StatelessWidget {
                                 ),
                               ),
                           ],
+                        ),
                       );
                     },
                   ),

lib/views/radar/radar.dart

@@ -285,7 +285,7 @@ class _RadarState extends State<Radar> {
           crossAxisAlignment: CrossAxisAlignment.start,
           children: [
             ItemTitle(
-              title: 'تاریخ رادار',
+              title: 'تاریخ ایجاد',
               style: Theme.of(context).textTheme.bodyMedium,
               icon: DidvanIcons.calendar_range_regular,
             ),