feat(ui): 增加视觉 token 与统一导航

lib/core/theme/app_theme.dart

@@ -1,8 +1,10 @@
 // Author: fruit.com.cn
 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 
 import 'app_colors.dart';
+import 'app_dimens.dart';
 
 /// Light paper and warm-cocoa themes for the Indonesia evening palette.
 abstract final class AppTheme {
@@ -80,6 +82,32 @@ abstract final class AppTheme {
         style: ButtonStyle(
           backgroundColor: WidgetStateProperty.resolveWith(_buttonColor),
           foregroundColor: const WidgetStatePropertyAll(AppColors.onPrimary),
+          minimumSize: const WidgetStatePropertyAll(
+            Size(0, AppDimens.buttonHeight),
+          ),
+        ),
+      ),
+      outlinedButtonTheme: OutlinedButtonThemeData(
+        style: ButtonStyle(
+          foregroundColor: WidgetStatePropertyAll(
+            dark ? AppColors.blueSoft : AppColors.bluePressed,
+          ),
+          minimumSize: const WidgetStatePropertyAll(
+            Size(0, AppDimens.buttonHeight),
+          ),
+          side: WidgetStatePropertyAll(
+            BorderSide(
+              color: dark ? AppColors.outlineDark : AppColors.outlineLight,
+            ),
+          ),
+        ),
+      ),
+      appBarTheme: const AppBarTheme(
+        systemOverlayStyle: SystemUiOverlayStyle.light,
+        titleTextStyle: TextStyle(
+          color: AppColors.cream,
+          fontSize: AppDimens.pageTitle,
+          fontWeight: FontWeight.w800,
         ),
       ),
       switchTheme: SwitchThemeData(