chore: Streamline background gradients

lib/config/themes.dart

@@ -41,6 +41,22 @@ abstract class FluffyThemes {
     titleSmall: fallbackTextStyle,
   );
 
+  static LinearGradient backgroundGradient(
+    BuildContext context,
+    int alpha,
+  ) {
+    final colorScheme = Theme.of(context).colorScheme;
+    return LinearGradient(
+      begin: Alignment.topCenter,
+      colors: [
+        colorScheme.primaryContainer.withAlpha(alpha),
+        colorScheme.secondaryContainer.withAlpha(alpha),
+        colorScheme.tertiaryContainer.withAlpha(alpha),
+        colorScheme.primaryContainer.withAlpha(alpha),
+      ],
+    );
+  }
+
   static const Duration animationDuration = Duration(milliseconds: 250);
   static const Curve animationCurve = Curves.easeInOut;
 

lib/pages/chat/chat_view.dart

@@ -146,7 +146,6 @@ class ChatView extends StatelessWidget {
       );
     }
     final bottomSheetPadding = FluffyThemes.isColumnMode(context) ? 16.0 : 8.0;
-    final colorScheme = Theme.of(context).colorScheme;
 
     return VWidgetGuard(
       onSystemPop: (redirector) async {
@@ -220,14 +219,9 @@ class ChatView extends StatelessWidget {
                       else
                         Container(
                           decoration: BoxDecoration(
-                            gradient: LinearGradient(
-                              begin: Alignment.topCenter,
-                              colors: [
-                                colorScheme.primaryContainer.withAlpha(64),
-                                colorScheme.secondaryContainer.withAlpha(64),
-                                colorScheme.tertiaryContainer.withAlpha(64),
-                                colorScheme.primaryContainer.withAlpha(64),
-                              ],
+                            gradient: FluffyThemes.backgroundGradient(
+                              context,
+                              64,
                             ),
                           ),
                         ),

lib/widgets/layouts/login_scaffold.dart

@@ -48,18 +48,9 @@ class LoginScaffold extends StatelessWidget {
           : null,
     );
     if (isMobileMode) return scaffold;
-    final colorScheme = Theme.of(context).colorScheme;
     return Container(
       decoration: BoxDecoration(
-        gradient: LinearGradient(
-          begin: Alignment.topCenter,
-          colors: [
-            colorScheme.primaryContainer.withAlpha(64),
-            colorScheme.secondaryContainer.withAlpha(64),
-            colorScheme.tertiaryContainer.withAlpha(64),
-            colorScheme.primaryContainer.withAlpha(64),
-          ],
-        ),
+        gradient: FluffyThemes.backgroundGradient(context, 156),
       ),
       child: Column(
         children: [