chore: 更新国际化翻译及 UI 组件优化

apps/lib/features/home/presentation/widgets/home_background_field.dart

@@ -1,5 +1,7 @@
 import 'package:flutter/material.dart';
 
+import '../../../../core/theme/design_tokens.dart';
+
 const homeBackgroundFieldKey = ValueKey('home_background_field');
 
 class HomeBackgroundField extends StatelessWidget {
@@ -13,12 +15,65 @@ class HomeBackgroundField extends StatelessWidget {
       key: homeBackgroundFieldKey,
       decoration: BoxDecoration(
         gradient: LinearGradient(
-          begin: Alignment.topCenter,
-          end: Alignment.bottomCenter,
-          colors: [colorScheme.surface, colorScheme.surfaceContainerLowest],
+          begin: Alignment.topLeft,
+          end: Alignment.bottomRight,
+          colors: [
+            colorScheme.surface,
+            colorScheme.surfaceContainerLow,
+            colorScheme.surface,
+          ],
+          stops: const [0, 0.38, 1],
+        ),
+      ),
+      child: Stack(
+        fit: StackFit.expand,
+        children: [
+          Positioned(
+            top: -(AppSpacing.xxl * 2),
+            left: -(AppSpacing.xxl * 2),
+            child: _AmbientOrb(
+              color: colorScheme.primaryContainer.withValues(alpha: 0.55),
+              size: AppSpacing.xxl * 8,
+            ),
+          ),
+          Positioned(
+            right: -(AppSpacing.xxl * 2),
+            top: AppSpacing.xxl,
+            child: _AmbientOrb(
+              color: colorScheme.secondaryContainer.withValues(alpha: 0.42),
+              size: AppSpacing.xxl * 6,
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _AmbientOrb extends StatelessWidget {
+  const _AmbientOrb({required this.color, required this.size});
+
+  final Color color;
+  final double size;
+
+  @override
+  Widget build(BuildContext context) {
+    return IgnorePointer(
+      child: Container(
+        width: size,
+        height: size,
+        decoration: BoxDecoration(
+          shape: BoxShape.circle,
+          gradient: RadialGradient(
+            colors: [
+              color,
+              color.withValues(alpha: 0.12),
+              color.withValues(alpha: 0),
+            ],
+            stops: const [0, 0.55, 1],
+          ),
         ),
       ),
-      child: const SizedBox.expand(),
     );
   }
 }