feat(ui06): App line A0-A7 — nav pill removal, light segments, bare summary, token alignment to app-preview

- tokens：次文字 #69778E、soft/card-border/seg 色组、输入圆角 10（kRadiusField）
- theme：导航 indicatorColor 透明+显式选中蓝；卡片去阴影改 1px #EDF0F5 边框；输入边框同步
- 新组件 SegmentTabs（#EDF1F6 轨道/选中实蓝/light 浅蓝变体/null 无高亮）替换 M3 SegmentedButton
- 上传中心：摘要去白卡直排+主数字 32/40；completed 次级筛选无高亮语义保留
- 相册卡 scrim 30% 起 #0C1728E8；导航角标红底白字白边；登录主标题 27/700
- theme_test 三处旧规格断言随 UI06 值更新；397/397 全绿、analyze 0 issues
- 真机证据：MuMu + 测试服务器 API，登录/相册/详情/上传 4 页截图确认达标
- 登记偏差：语义色保持对比度合规深色版；视口矩阵随 G2；详见验收记录 §6

Co-Authored-By: Claude Code <noreply@anthropic.com>

apps/mobile/test/app/theme_test.dart

@@ -31,7 +31,7 @@ void main() {
       expect(AppTheme.light.dividerTheme.color, kColorDivider);
       expect(kColorDivider, const Color(0xFFE5EAF1));
       expect(scheme.onSurfaceVariant, kColorTextSecondary);
-      expect(kColorTextSecondary, const Color(0xFF5E6878));
+      expect(kColorTextSecondary, const Color(0xFF69778E)); // UI06: app-preview --muted
     });
   });
 
@@ -104,10 +104,10 @@ void main() {
       );
     });
 
-    test('输入框圆角 12', () {
+    test('输入框圆角 10（UI06: app-preview .field）', () {
       final border = theme.inputDecorationTheme.border as OutlineInputBorder;
-      expect(border.borderRadius, BorderRadius.circular(kRadiusInput));
-      expect(kRadiusInput, 12);
+      expect(border.borderRadius, BorderRadius.circular(kRadiusField));
+      expect(kRadiusField, 10);
     });
 
     test('Dialog 圆角 16、BottomSheet 顶部圆角 16', () {
@@ -125,11 +125,8 @@ void main() {
       expect(kRadiusCard, 16);
     });
 
-    test('底部导航指示器色已配置', () {
-      expect(
-        theme.navigationBarTheme.indicatorColor,
-        theme.colorScheme.secondaryContainer,
-      );
+    test('底部导航无胶囊指示器（UI06: app-preview .nav）', () {
+      expect(theme.navigationBarTheme.indicatorColor, Colors.transparent);
     });
   });