feat: import Chinese-localized Buzz source snapshot

Signed-off-by: cls_宁波本机 <908705107@qq.com>

mobile/lib/shared/widgets/skeleton_shimmer.dart

@@ -0,0 +1,71 @@
+part of 'skeleton.dart';
+
+/// Sweeps one shared highlight across a group of skeleton elements.
+///
+/// This mirrors desktop's two-second linear shimmer. Reduced-motion users see
+/// the same element shapes without the moving highlight.
+class SkeletonShimmer extends HookWidget {
+  final Widget child;
+  final bool enabled;
+
+  const SkeletonShimmer({required this.child, this.enabled = true, super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final animation = useAnimationController(duration: _shimmerDuration);
+    final reducedMotion = MediaQuery.disableAnimationsOf(context);
+    final colors = context.colors;
+    final baseColor = colors.primary.withValues(alpha: _skeletonOpacity);
+    final highlightColor = colors.primary.withValues(
+      alpha: _skeletonOpacity * _shimmerMinOpacity,
+    );
+
+    useEffect(() {
+      if (reducedMotion || !enabled) {
+        animation
+          ..stop()
+          ..value = 0;
+      } else {
+        animation.repeat();
+      }
+      return animation.stop;
+    }, [animation, enabled, reducedMotion]);
+
+    if (reducedMotion || !enabled) {
+      return _SkeletonMask(
+        child: ColorFiltered(
+          colorFilter: ColorFilter.mode(baseColor, BlendMode.srcIn),
+          child: child,
+        ),
+      );
+    }
+
+    return _SkeletonMask(
+      child: RepaintBoundary(
+        child: AnimatedBuilder(
+          animation: animation,
+          child: child,
+          builder: (context, child) {
+            final center = -1.5 + (animation.value * 3);
+            return ShaderMask(
+              blendMode: BlendMode.srcIn,
+              shaderCallback: (bounds) => LinearGradient(
+                begin: Alignment(center - 1, 0),
+                end: Alignment(center + 1, 0),
+                colors: [
+                  baseColor,
+                  baseColor,
+                  highlightColor,
+                  baseColor,
+                  baseColor,
+                ],
+                stops: const [0, 0.34, 0.5, 0.66, 1],
+              ).createShader(bounds),
+              child: child,
+            );
+          },
+        ),
+      ),
+    );
+  }
+}