🎨 Use SizedBox.shrink instead of empty SizedBox for placeholder

lib/screens/about.dart

@@ -36,7 +36,7 @@ class AboutScreen extends StatelessWidget {
               future: PackageInfo.fromPlatform(),
               builder: (context, snapshot) {
                 if (!snapshot.hasData) {
-                  return const SizedBox();
+                  return const SizedBox.shrink();
                 }
 
                 return Text(

lib/screens/channel/call/call.dart

@@ -84,7 +84,7 @@ class _CallScreenState extends State<CallScreen> with TickerProviderStateMixin {
                     participant: call.focusTrack.value!,
                     onTap: () {},
                   )
-                : const SizedBox(),
+                : const SizedBox.shrink(),
           ),
           Positioned(
             left: 0,

lib/screens/channel/channel_chat.dart

@@ -222,7 +222,7 @@ class _ChannelChatScreenState extends State<ChannelChatScreen>
         actions: [
           const BackgroundStateWidget(),
           Builder(builder: (context) {
-            if (_isBusy || _channel == null) return const SizedBox();
+            if (_isBusy || _channel == null) return const SizedBox.shrink();
 
             return ChatCallButton(
               realm: _channel!.realm,
@@ -299,7 +299,7 @@ class _ChannelChatScreenState extends State<ChannelChatScreen>
                     if (_chatController.isLoading.isTrue) {
                       return const LinearProgressIndicator().animate().slideY();
                     } else {
-                      return const SizedBox();
+                      return const SizedBox.shrink();
                     }
                   }),
                   ClipRect(
@@ -350,7 +350,7 @@ class _ChannelChatScreenState extends State<ChannelChatScreen>
                   ]),
                 );
               }
-              return const SizedBox();
+              return const SizedBox.shrink();
             }),
           ],
         );

lib/screens/chat.dart

@@ -112,7 +112,7 @@ class _ChatScreenState extends State<ChatScreen> {
             children: [
               Obx(() {
                 if (_channels.isLoading.isFalse) {
-                  return const SizedBox();
+                  return const SizedBox.shrink();
                 } else {
                   return const LinearProgressIndicator();
                 }

lib/screens/dashboard.dart

@@ -190,7 +190,7 @@ class _DashboardScreenState extends State<DashboardScreen> {
                         icon: const Icon(Icons.local_fire_department),
                         onPressed: _signingDaily ? null : _signDaily,
                       )
-                    : const SizedBox(),
+                    : const SizedBox.shrink(),
               ),
             ),
           ).paddingSymmetric(horizontal: 8),

lib/screens/feed.dart

@@ -155,7 +155,7 @@ class PostCreatePopup extends StatelessWidget {
     final AuthProvider auth = Get.find();
 
     if (auth.isAuthorized.isFalse) {
-      return const SizedBox();
+      return const SizedBox.shrink();
     }
 
     final List<dynamic> actionList = [