fix: protect NiceButton disabled colors from consumer implicit Label style

NiceEntry/NiceButton.cs

@@ -62,6 +62,9 @@ public NiceButton()
             FontSize = FontSize
         };
 
+        NeutralizeInheritedVisualStates(_iconLabel);
+        NeutralizeInheritedVisualStates(_textLabel);
+
         _contentHost = new Grid
         {
             HorizontalOptions = LayoutOptions.Center,
@@ -89,6 +92,21 @@ public NiceButton()
         UpdateShadowView();
     }
 
+    // Stock MAUI app templates ship an implicit Label style whose CommonStates/Disabled visual
+    // state sets a grey TextColor. When the button is disabled, IsEnabled propagates to the inner
+    // labels and that inherited style attaches its visual states to them — and visual-state setters
+    // outrank locally-set values, so they override the colors ApplyColors assigns (defeating both the
+    // disabled-contrast handling and DisabledTextColor). Giving each label its own element-level
+    // CommonStates group with empty states suppresses the inherited style's states (an element-level
+    // group outranks a style-level one), leaving ApplyColors with the final say.
+    private static void NeutralizeInheritedVisualStates(VisualElement label)
+    {
+        var common = new VisualStateGroup { Name = "CommonStates" };
+        common.States.Add(new VisualState { Name = "Normal" });
+        common.States.Add(new VisualState { Name = "Disabled" });
+        VisualStateManager.SetVisualStateGroups(label, new VisualStateGroupList { common });
+    }
+
     /// <summary>True when the button must be measured square (Circle shape).</summary>
     internal bool ForceSquare => ButtonShape == ButtonShape.Circle;
 

README.md

@@ -235,6 +235,8 @@ Override them when you need to match your app's own palette:
 
 `null` (the default) means "use the built-in themed colors."
 
+The disabled colors are applied directly to the button's internal labels and are protected from being overridden by your app's implicit `Label` style: `NiceButton` installs its own (empty) `CommonStates` visual-state group on those labels, so a stock template's `Disabled` visual state can't recolor them behind your back. You don't need to do anything for this to work.
+
 ### Enums and constants
 
 - **`ButtonShape`** — `Rectangle`, `Rounded`, `Circle`