refactor(apps): 主题系统迁移至 ColorScheme + 扩展架构并支持 Dark Mode

apps/lib/shared/widgets/app_pressable.dart

@@ -1,7 +1,5 @@
 import 'package:flutter/material.dart';
 
-import '../../core/theme/design_tokens.dart';
-
 class AppPressable extends StatefulWidget {
   const AppPressable({
     super.key,
@@ -25,25 +23,22 @@ class _AppPressableState extends State<AppPressable> {
 
   @override
   Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
     return AnimatedScale(
       scale: _isPressed ? widget.pressedScale : 1,
       duration: const Duration(milliseconds: 110),
       curve: Curves.easeOut,
       child: Material(
-        color: Colors.transparent,
+        color: colorScheme.surface.withValues(alpha: 0),
         child: InkWell(
           borderRadius: widget.borderRadius,
           onTap: widget.onTap,
           onHighlightChanged: (pressed) {
-            if (_isPressed == pressed) {
-              return;
-            }
-            setState(() {
-              _isPressed = pressed;
-            });
+            if (_isPressed == pressed) return;
+            setState(() => _isPressed = pressed);
           },
-          splashColor: AppColors.blue100.withValues(alpha: 0.32),
-          highlightColor: AppColors.blue50.withValues(alpha: 0.28),
+          splashColor: colorScheme.primary.withValues(alpha: 0.12),
+          highlightColor: colorScheme.primary.withValues(alpha: 0.08),
           child: widget.child,
         ),
       ),