feat(flutter): 强化开屏品牌标识展示

lib/pages/splash/splash_page.dart

@@ -8,8 +8,8 @@ import 'package:flutter/services.dart';
 import '../../core/theme/app_colors.dart';
 
 const Color _splashBackground = Color(0xFF100C0A);
-const Color _markGlow = Color(0x33FF7A1A);
-const double _markSize = 96;
+const Color _markGlow = Color(0x40FF7A1A);
+const double _markSize = 112;
 const double _markRadius = 24;
 const double _logoGlowSize = 144;
 const double _logoGlowBlur = 40;
@@ -130,6 +130,7 @@ class _SplashPageState extends State<SplashPage>
             alignment: Alignment.center,
             children: [
               ImageFiltered(
+                key: const Key('splash-logo-glow'),
                 imageFilter: ImageFilter.blur(
                   sigmaX: _logoGlowBlur,
                   sigmaY: _logoGlowBlur,
@@ -149,6 +150,7 @@ class _SplashPageState extends State<SplashPage>
                 borderRadius: BorderRadius.circular(_markRadius),
                 child: Image.asset(
                   _markAsset,
+                  key: const Key('splash-logo-mark'),
                   width: _markSize,
                   height: _markSize,
                   filterQuality: FilterQuality.medium,

test/splash/splash_gate_test.dart

@@ -53,6 +53,23 @@ void main() {
     expect(find.byKey(const Key('splash-brand')), findsOneWidget);
     expect(find.byKey(const Key('splash-tagline')), findsOneWidget);
     expect(find.byKey(const Key('splash-loading')), findsOneWidget);
+    final mark = tester.widget<Image>(
+      find.byKey(const Key('splash-logo-mark')),
+    );
+    expect((mark.image as AssetImage).assetName, 'assets/icon/splash_mark.png');
+    expect(mark.width, 112);
+    expect(mark.height, 112);
+    final glow = tester.widget<Container>(
+      find.descendant(
+        of: find.byKey(const Key('splash-logo-glow')),
+        matching: find.byType(Container),
+      ),
+    );
+    final glowGradient = (glow.decoration as BoxDecoration).gradient;
+    expect(
+      (glowGradient as RadialGradient).colors.first,
+      const Color(0x40FF7A1A),
+    );
     expect(
       tester.widget<ColoredBox>(find.byKey(const Key('splash-screen'))).color,
       const Color(0xFF100C0A),