Frontend first draft

frontend/pweb/lib/utils/dimensions.dart

@@ -0,0 +1,48 @@
+class AppDimensions {
+  final double paddingSmall;
+  final double paddingMedium;
+  final double paddingLarge;
+  final double paddingXLarge;
+  final double paddingXXLarge;
+  final double paddingXXXLarge;
+  
+  final double spacingSmall;
+  
+  final double borderRadiusSmall;
+  final double borderRadiusMedium;
+  
+  final double maxContentWidth;
+  final double buttonWidth;
+  final double buttonHeight;
+  
+  final double iconSizeLarge;
+  final double iconSizeMedium;
+  final double iconSizeSmall;
+
+  final double elevationSmall;
+
+  const AppDimensions({
+    this.paddingSmall = 8,
+    this.paddingMedium = 12,
+    this.paddingLarge = 16,
+    this.paddingXLarge = 20,
+    this.paddingXXLarge = 25,
+    this.paddingXXXLarge = 30,
+    
+    this.spacingSmall = 5,
+    
+    
+    this.borderRadiusSmall = 12,
+    this.borderRadiusMedium = 16,
+    
+    this.maxContentWidth = 500,
+    this.buttonWidth = 300,
+    this.buttonHeight = 40,
+    
+    this.iconSizeLarge = 30,
+    this.iconSizeMedium = 24,
+    this.iconSizeSmall = 20,
+
+    this.elevationSmall = 4,
+  });
+}