chore: Minor design improvements

lib/pages/chat_details/chat_details_view.dart

@@ -81,10 +81,12 @@ class ChatDetailsView extends StatelessWidget {
                       Theme.of(context).appBarTheme.backgroundColor,
                   flexibleSpace: FlexibleSpaceBar(
                     background: ContentBanner(
-                        mxContent: room.avatar,
-                        onEdit: room.canSendEvent('m.room.avatar')
-                            ? controller.setAvatarAction
-                            : null),
+                      mxContent: room.avatar,
+                      onEdit: room.canSendEvent('m.room.avatar')
+                          ? controller.setAvatarAction
+                          : null,
+                      defaultIcon: Icons.group_outlined,
+                    ),
                   ),
                 ),
               ],

lib/pages/chat_list/chat_list.dart

@@ -163,7 +163,7 @@ class ChatListController extends State<ChatList> with TickerProviderStateMixin {
 
   Stream<Client> get clientStream => _clientStream.stream;
 
-  void addAccountAction() => VRouter.of(context).to('/settings/account/add');
+  void addAccountAction() => VRouter.of(context).to('/settings/account');
 
   void _onScroll() {
     final newScrolledToTop = scrollController.position.pixels <= 0;

lib/pages/settings/settings_view.dart

@@ -31,7 +31,7 @@ class SettingsView extends StatelessWidget {
               background: ContentBanner(
                 mxContent: controller.profile?.avatarUrl,
                 onEdit: controller.setAvatarAction,
-                defaultIcon: Icons.person_outline_outlined,
+                defaultIcon: Icons.account_circle_outlined,
               ),
             ),
           ),

lib/pages/user_bottom_sheet/user_bottom_sheet_view.dart

@@ -119,7 +119,7 @@ class UserBottomSheetView extends StatelessWidget {
                   Expanded(
                     child: ContentBanner(
                       mxContent: user.avatarUrl,
-                      defaultIcon: Icons.person_outline,
+                      defaultIcon: Icons.account_circle_outlined,
                       client: client,
                     ),
                   ),

lib/widgets/content_banner.dart

@@ -19,7 +19,7 @@ class ContentBanner extends StatelessWidget {
   const ContentBanner(
       {this.mxContent,
       this.height = 400,
-      this.defaultIcon = Icons.people_outlined,
+      this.defaultIcon = Icons.account_circle_outlined,
       this.loading = false,
       this.onEdit,
       this.client,
@@ -34,7 +34,7 @@ class ContentBanner extends StatelessWidget {
       height: height,
       alignment: Alignment.center,
       decoration: BoxDecoration(
-        color: Theme.of(context).secondaryHeaderColor,
+        color: Theme.of(context).colorScheme.secondaryContainer,
       ),
       child: Stack(
         children: <Widget>[
@@ -66,10 +66,20 @@ class ContentBanner extends StatelessWidget {
                         imageUrl: src.toString(),
                         height: 300,
                         fit: BoxFit.cover,
-                        errorWidget: (c, m, e) => Icon(defaultIcon, size: 200),
+                        errorWidget: (c, m, e) => Icon(
+                          defaultIcon,
+                          size: 200,
+                          color: Theme.of(context)
+                              .colorScheme
+                              .onSecondaryContainer,
+                        ),
                       );
                     })
-                  : Icon(defaultIcon, size: 200),
+                  : Icon(
+                      defaultIcon,
+                      size: 200,
+                      color: Theme.of(context).colorScheme.onSecondaryContainer,
+                    ),
             ),
           ),
           if (onEdit != null)

lib/widgets/profile_bottom_sheet.dart

@@ -76,7 +76,7 @@ class ProfileBottomSheet extends StatelessWidget {
                                 )
                               : ContentBanner(
                                   mxContent: profile.avatarUrl,
-                                  defaultIcon: Icons.person_outline,
+                                  defaultIcon: Icons.account_circle_outlined,
                                   client: Matrix.of(context).client,
                                 ),
                         ),

lib/widgets/public_room_bottom_sheet.dart

@@ -114,7 +114,7 @@ class PublicRoomBottomSheet extends StatelessWidget {
                           ContentBanner(
                             mxContent: profile.avatarUrl,
                             height: 156,
-                            defaultIcon: Icons.person_outline,
+                            defaultIcon: Icons.group_outlined,
                             client: Matrix.of(context).client,
                           ),
                         ListTile(