fix: LineLayer shape 切换后重建模型

[lzxue]

问题

修复 Issue #2714: 线图层shape默认line，切换到arc，再切回来，图层消失

原因

当调用 layer.shape() 方法改变 shape 时，没有触发模型重建。

解决方案

在 LineLayer 中重写 rebuildModels 方法，类似于 PointLayer 的做法，在 shape 改变后调用 buildModels 重建模型。

测试

const layer = new LineLayer()
  .source(data)
  .shape(line)
  .style({ stroke: #f00 })

// 切换到 arc 
layer.shape("arc")

// 再切回 line - 之前会消失，现在应该正常显示
layer.shape("line")

[changeset-bot]

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[gemini-code-assist]

Code Review

This pull request adds a rebuildModels method to LineLayer. However, as noted in the review, this implementation is redundant because the base class BaseLayer already provides the same functionality, and the method should be removed to simplify the codebase.

[gemini-code-assist]

rebuildModels 方法已经在基类 BaseLayer 中以完全相同的逻辑实现。由于 LineLayer 继承自 BaseLayer，这个显式的覆盖是多余的，可以移除以简化代码。继承的方法会调用 this.buildModels()，并正确地解析为 LineLayer 中的实现。