Scaling: many improvements and fixes

- radius are not pixels, they should not be scaled
- use "screen" instead of "Screen" which helps a lot in some places

Settings/Theme.qml

@@ -9,17 +9,14 @@ Singleton {
     id: root
 
     // Design screen width
-    readonly property int designScreenWidth: 1920
-    
-    // Scaling dampening factor - reduces the scaling effect for higher resolutions
-    readonly property real scalingDampening: 0.2
+    readonly property int designScreenWidth: 2560
     
     // Automatic scaling based on screen width
     function scale(currentScreen) {
-        if (currentScreen !== undefined) {
-            var rawRatio = currentScreen.width / designScreenWidth;
-            // Apply dampening to reduce scaling for higher resolutions
-            return Math.min(2.0, 1.0 + (rawRatio - 1.0) * scalingDampening);
+        if (currentScreen.width != 0) {
+            var ratio = currentScreen.width / designScreenWidth;
+            // Limit the final scale range between [0.8...2]
+            return Math.max(0.8, Math.min(2.0, ratio));
         }
         return 1.0;
     }