chore: Follow up paddings

lib/pages/chat/chat_event_list.dart

@@ -44,7 +44,7 @@ class ChatEventList extends StatelessWidget {
       child: ListView.custom(
         padding: EdgeInsets.only(
           top: 16,
-          bottom: 4,
+          bottom: 12,
           left: horizontalPadding,
           right: horizontalPadding,
         ),

lib/pages/chat/chat_view.dart

@@ -272,7 +272,11 @@ class ChatView extends StatelessWidget {
                           if (controller.room.canSendDefaultMessages &&
                               controller.room.membership == Membership.join)
                             Container(
-                              margin: EdgeInsets.all(bottomSheetPadding),
+                              margin: EdgeInsets.only(
+                                bottom: bottomSheetPadding,
+                                left: bottomSheetPadding,
+                                right: bottomSheetPadding,
+                              ),
                               constraints: const BoxConstraints(
                                 maxWidth: FluffyThemes.columnWidth * 2.5,
                               ),