feat: Add global enableFeedback configuration to ThemeData

[lschaupp]

• Add enableFeedback property to ThemeData for app-wide control
• Update Button widget to respect theme setting
• Add enableFeedback parameter to NavigationButton
• Fixes audio ducking on iOS during music playback

This change allows users to globally control tap sounds/haptic feedback through the theme, which is particularly useful for music/audio apps where iOS audio ducking creates a poor UX.

The implementation is backwards compatible - when enableFeedback is null (default), the existing platform-specific behavior is preserved.

[sunarya-thito]

I suspect there is some kind of different dart formatting here? The pull-request changes contains unnecesarry large diffs