feat(theme): 接入 Obsidian Flare 设计系统

lib/core/theme/app_theme.dart

@@ -6,9 +6,10 @@ import 'package:flutter/services.dart';
 import 'app_colors.dart';
 import 'app_dimens.dart';
 
-/// Light paper and warm-cocoa themes for the Indonesia evening palette.
+/// Obsidian Flare themes. Dark is the product default; light mirrors the same
+/// orange primary for system-light devices.
 abstract final class AppTheme {
-  static const _lightBackground = Color(0xFFFFF6F1);
+  static const _lightBackground = Color(0xFFF7F7F8);
   static const _darkBackground = AppColors.ink;
 
   /// Light theme for system light mode.
@@ -22,7 +23,7 @@ abstract final class AppTheme {
   static ThemeData dark() => _build(
     brightness: Brightness.dark,
     surface: _darkBackground,
-    accent: AppColors.blueSoft,
+    accent: AppColors.blue,
   );
 
   static ThemeData _build({
@@ -35,27 +36,27 @@ abstract final class AppTheme {
         ? const ColorScheme.dark(
             primary: AppColors.blue,
             onPrimary: AppColors.onPrimary,
-            secondary: AppColors.blueSoft,
-            onSecondary: AppColors.ink,
+            secondary: AppColors.secondary,
+            onSecondary: AppColors.onPrimary,
             primaryContainer: AppColors.bluePressed,
             onPrimaryContainer: AppColors.onPrimary,
-            secondaryContainer: AppColors.bluePressed,
+            secondaryContainer: AppColors.raised,
             onSecondaryContainer: AppColors.onPrimary,
             surface: _darkBackground,
-            onSurface: AppColors.cream,
+            onSurface: AppColors.onSurface,
             outline: AppColors.outlineDark,
             outlineVariant: AppColors.outlineVariantDark,
-            surfaceTint: AppColors.blueSoft,
+            surfaceTint: AppColors.blue,
             inversePrimary: AppColors.blueSoft,
           )
         : ColorScheme.light(
             primary: AppColors.blue,
             onPrimary: AppColors.onPrimary,
-            secondary: AppColors.blue,
+            secondary: AppColors.secondary,
             onSecondary: AppColors.onPrimary,
-            primaryContainer: AppColors.blueSoft.withValues(alpha: 0.22),
+            primaryContainer: AppColors.blue.withValues(alpha: 0.14),
             onPrimaryContainer: AppColors.ink,
-            secondaryContainer: AppColors.blueSoft.withValues(alpha: 0.22),
+            secondaryContainer: AppColors.blueSoft.withValues(alpha: 0.14),
             onSecondaryContainer: AppColors.ink,
             surface: _lightBackground,
             onSurface: AppColors.ink,
@@ -64,11 +65,12 @@ abstract final class AppTheme {
             surfaceTint: AppColors.blue,
             inversePrimary: AppColors.blueSoft,
           );
-    return ThemeData(
+    final base = ThemeData(
       useMaterial3: true,
       brightness: brightness,
       colorScheme: scheme,
       scaffoldBackgroundColor: surface,
+      fontFamily: 'PlusJakartaSans',
       progressIndicatorTheme: ProgressIndicatorThemeData(color: accent),
       sliderTheme: SliderThemeData(
         activeTrackColor: accent,
@@ -105,7 +107,8 @@ abstract final class AppTheme {
       appBarTheme: const AppBarTheme(
         systemOverlayStyle: SystemUiOverlayStyle.light,
         titleTextStyle: TextStyle(
-          color: AppColors.cream,
+          color: AppColors.onSurface,
+          fontFamily: 'Outfit',
           fontSize: AppDimens.pageTitle,
           fontWeight: FontWeight.w800,
         ),
@@ -125,8 +128,29 @@ abstract final class AppTheme {
         contentTextStyle: const TextStyle(color: AppColors.onPrimary),
       ),
     );
+    final textTheme = base.textTheme
+        .apply(
+          fontFamily: 'PlusJakartaSans',
+          bodyColor: dark ? AppColors.cream : AppColors.ink,
+          displayColor: dark ? AppColors.onSurface : AppColors.ink,
+        )
+        .copyWith(
+          displayLarge: _display(base.textTheme.displayLarge, dark),
+          displayMedium: _display(base.textTheme.displayMedium, dark),
+          displaySmall: _display(base.textTheme.displaySmall, dark),
+          headlineLarge: _display(base.textTheme.headlineLarge, dark),
+          headlineMedium: _display(base.textTheme.headlineMedium, dark),
+          headlineSmall: _display(base.textTheme.headlineSmall, dark),
+          titleLarge: _display(base.textTheme.titleLarge, dark),
+        );
+    return base.copyWith(textTheme: textTheme);
   }
 
+  static TextStyle? _display(TextStyle? style, bool dark) => style?.copyWith(
+    fontFamily: 'Outfit',
+    color: dark ? AppColors.onSurface : AppColors.ink,
+  );
+
   static Color _buttonColor(Set<WidgetState> states) {
     if (states.contains(WidgetState.pressed) ||
         states.contains(WidgetState.hovered) ||