fix(ui): refine acrylic controls and timeline interactions

Restore full acrylic materials to stacked task cards and floating controls.
Extend the map behind the navigation header while preserving document and
control insets. Align timeline and scale readouts, refresh dense-marker
hover content, and highlight model and approval menu options.

Keep narrow timeline headers clear of their legend and actions. Update
coupled geometry checks and retain city zoom-12 and menu regression coverage.

Validation: scoped git diff --check and read-only UI geometry inspection.
Test suites were not rerun at the user's request.

docs/component-design-system.md

@@ -51,6 +51,8 @@
 
 每个业务区按“定位、状态、下一步、证据”排列。侧栏内容使用 12px 至 14px 的紧凑间距。复杂原始对象、请求参数、历史和测试资源按需展开。移动端保持单列，不用横向滚动承载业务字段。
 
+地图背景延伸到顶部导航背后，地图控件和分析正文仍预留 56px 导航高度。独立浮层使用完整亚克力材质，阅读面和控件内部的填色不额外叠加模糊；任务堆叠保留完整圆角和每层 7px 的错位。时间轴容器不足 640px 时省略统计摘要，优先保证日期、图例和操作按钮互不重叠。
+
 ## 6. 层级与深度
 
 保持既有亚克力半透明材质，在透底、模糊、噪点和边缘高光上调整色调。桌面 Agent dock 延续既有实底布局，使用银灰色调。