fix: Contrast in dark mode

lib/config/themes.dart

@@ -132,7 +132,7 @@ abstract class FluffyThemes {
               primary: FluffyThemes.lighten(AppConfig.chatColor, 0.33),
               secondary: FluffyThemes.lighten(AppConfig.chatColor, 0.33),
               secondaryVariant: AppConfig.secondaryColor,
-              surface: FluffyThemes.darken(AppConfig.chatColor, 0.25, 0.2),
+              surface: FluffyThemes.darken(AppConfig.chatColor, 0.4),
             ),
         secondaryHeaderColor: Colors.blueGrey.shade900,
         textTheme: Typography.material2018().white.merge(fallbackTextTheme),
@@ -212,28 +212,21 @@ abstract class FluffyThemes {
           ? Colors.white
           : Colors.black;
 
-  static Color darken(Color color, [double amount = .1, double saturation]) {
+  static Color darken(Color color, [double amount = .1]) {
     assert(amount >= 0 && amount <= 1);
 
     final hsl = HSLColor.fromColor(color);
-    var hslDark = hsl.withLightness((hsl.lightness - amount).clamp(0.0, 1.0));
-    if (saturation != null) {
-      hslDark =
-          hslDark.withSaturation((hsl.saturation - saturation).clamp(0.0, 1.0));
-    }
+    final hslDark = hsl.withLightness((hsl.lightness - amount).clamp(0.0, 1.0));
 
     return hslDark.toColor();
   }
 
-  static Color lighten(Color color, [double amount = .1, double saturation]) {
+  static Color lighten(Color color, [double amount = .1]) {
     assert(amount >= 0 && amount <= 1);
 
     final hsl = HSLColor.fromColor(color);
-    var hslLight = hsl.withLightness((hsl.lightness + amount).clamp(0.0, 1.0));
-    if (saturation != null) {
-      hslLight = hslLight
-          .withSaturation((hsl.saturation - saturation).clamp(0.0, 1.0));
-    }
+    final hslLight =
+        hsl.withLightness((hsl.lightness + amount).clamp(0.0, 1.0));
 
     return hslLight.toColor();
   }

lib/pages/chat/events/message.dart

@@ -59,7 +59,9 @@ class Message extends StatelessWidget {
     final client = Matrix.of(context).client;
     final ownMessage = event.senderId == client.userID;
     final alignment = ownMessage ? Alignment.topRight : Alignment.topLeft;
-    var color = Theme.of(context).scaffoldBackgroundColor;
+    var color = Theme.of(context).brightness == Brightness.light
+        ? Colors.white
+        : Colors.grey.shade900;
     final displayTime = event.type == EventTypes.RoomCreate ||
         nextEvent == null ||
         !event.originServerTs.sameEnvironment(nextEvent.originServerTs);

lib/pages/chat/events/state_message.dart

@@ -31,7 +31,9 @@ class StateMessage extends StatelessWidget {
           child: Container(
             padding: const EdgeInsets.all(8),
             decoration: BoxDecoration(
-              color: Theme.of(context).scaffoldBackgroundColor,
+              color: Theme.of(context).brightness == Brightness.light
+                  ? Colors.white
+                  : Colors.grey.shade900,
               borderRadius: BorderRadius.circular(AppConfig.borderRadius / 2),
             ),
             child: Column(