feat(theme): 接入 Obsidian Flare 设计系统

lib/core/widgets/glass_panel.dart

@@ -0,0 +1,54 @@
+// Author: fruit.com.cn
+
+import 'dart:ui';
+
+import 'package:flutter/material.dart';
+
+import '../theme/app_colors.dart';
+import '../theme/app_dimens.dart';
+
+/// Dark glass surface used by the home info card and floating controls.
+class GlassPanel extends StatelessWidget {
+  const GlassPanel({
+    super.key,
+    required this.child,
+    this.radius = AppDimens.glassRadius,
+    this.blur = AppDimens.glassBlur,
+    this.padding,
+    this.borderColor = AppColors.glassBorder,
+    this.gradient,
+  });
+
+  final Widget child;
+  final double radius;
+  final double blur;
+  final EdgeInsetsGeometry? padding;
+  final Color borderColor;
+  final Gradient? gradient;
+
+  @override
+  Widget build(BuildContext context) {
+    final borderRadius = BorderRadius.circular(radius);
+    final surface = DecoratedBox(
+      decoration: BoxDecoration(
+        borderRadius: borderRadius,
+        border: Border.all(color: borderColor),
+        gradient:
+            gradient ??
+            const LinearGradient(
+              begin: Alignment.topLeft,
+              end: Alignment.bottomRight,
+              colors: [Color(0x24FFFFFF), Color(0x0DFFFFFF)],
+            ),
+      ),
+      child: Padding(padding: padding ?? EdgeInsets.zero, child: child),
+    );
+    return ClipRRect(
+      borderRadius: borderRadius,
+      child: BackdropFilter(
+        filter: ImageFilter.blur(sigmaX: blur, sigmaY: blur),
+        child: surface,
+      ),
+    );
+  }
+}