[leoafarias]

Related issue

None.

Description

Adds BoxStyler.pressable(...), which returns a PressableBox that uses the style:

final button = BoxStyler()
    .padding(.all(16))
    .color(Colors.blue)
    .onPressed(.color(Colors.indigo));
final label = TextStyler().color(Colors.white).fontWeight(.w600);

button.pressable(onPress: save, child: label('Save'));

It's shorthand for PressableBox(style: button, ...) and takes the same parameters, with the same defaults. Pressable stays outside the Box, so .onHovered, .onPressed, .onFocused and .onDisabled on the style still resolve. This replaces the earlier callable Pressable*Builder design from this branch, which never shipped.

Changes

• BoxStylerPressable extension in pressable_widget.dart, next to PressableBox.
• Tests: defaults match const PressableBox(...), every parameter is forwarded, and tap plus onPressed styling work end to end.
• CHANGELOG entry, a README snippet, a section in guides/api-composition-guidelines.md, and updated Mix skill references and examples.

Review Checklist

• Testing: flutter test test/src/specs/pressable (69 passed), dart format and dart analyze clean on the touched files.
• Breaking Changes: None. This is a new extension method.
• Documentation Updates: CHANGELOG, README, guide and skills.
• Website Updates: Follow-up in btwld/mix-docs.