fix(controls): ui:Button foreground error on pressed

[emako]

Pull request type

Please check the type of change your PR introduces:

• Update
• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes

What is the current behavior?

#1722

Issue Number: 1722

What is the new behavior?

• The foreground color of ui:Button will return to the correct value.

Other information

[Copilot]

Pull request overview

Fixes the Wpf.Ui.Controls.Button control template so the text/icon foreground is correctly applied during Pressed and Disabled states (addressing #1722), restoring the expected foreground after interaction.

Changes:

• Update the pressed-state trigger to set TextElement.Foreground on the template’s ContentPresenter and ControlIcon instead of setting the button’s Foreground.
• Update the disabled-state trigger similarly to ensure both content and icon reflect the disabled foreground brush.