fix: 修复天地图图层被覆盖的问题 (#2852)

[lzxue]

修复 Issue #2852: 天地图的组件被地图覆盖

问题原因

• .tdt-pane 设置了 position: absolute
• #tdt-L7 容器继承了父元素的定位方式
• 导致 L7 图层被天地图底图覆盖

解决方案

• 为 #tdt-L7 容器添加 position: relative 样式
• 使其建立新的定位上下文，防止被父元素覆盖

测试

请验证天地图示例中 PointLayer 等图层能够正常显示在地图上方，不再被地图覆盖。

Reference: #2852

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[gemini-code-assist]

Code Review

This pull request updates the TdtMapService in packages/maps/src/tdtmap/map.ts to set the CSS position of the layer container, aiming to resolve an issue where the layer was being obscured. The reviewer suggests using absolute positioning instead of relative to ensure consistency with existing methods like addMarkerContainer and to prevent potential layout interference with other map elements.

[gemini-code-assist]

建议将 position 设置为 absolute 而不是 relative。

1. 一致性：该类中的 addMarkerContainer 方法（第 42 行）也使用了 absolute 定位，保持一致性有助于代码维护。
2. 布局稳定性：在地图容器中，使用 absolute 定位可以确保图层容器脱离文档流，避免对地图的其他子元素（如控件、比例尺等）产生潜在的布局挤压影响。
3. 通用实践：对于需要通过 transform 进行精确定位的地图覆盖物容器，使用 absolute 是更通用的做法。

Suggested change

	container.style.position = 'relative'; // 修复天地图图层被覆盖的问题
	container.style.position = 'absolute'; // 修复天地图图层被覆盖的问题