refactor(wlroots): remove unused last_pos_ / has_clicked_ state

[mx6436]

The Ended phase in WaylandClient::pointer only sends a button release and ignores coordinates. The framework guarantees position is already set via touch_down/touch_move before touch_up, so tracking last_pos_ served no purpose.

Made-with: Cursor

Summary by Sourcery

通过移除未使用的指针位置跟踪，并将触摸事件直接委托给 Wayland 客户端，简化 Wayland 触摸处理。

增强内容：

• 从 WlRootsControlUnitMgr 的触摸处理逻辑中移除未使用的 last_pos_ 和 has_clicked_ 状态。
• 精简 touch_down、touch_move 和 touch_up，使其在不增加额外状态或坐标逻辑的前提下，直接将指针事件转发给 Wayland 客户端。

Original summary in English

Summary by Sourcery

Simplify Wayland touch handling by removing unused pointer position tracking and delegating touch events directly to the Wayland client.

Enhancements:

• Remove unused last_pos_ and has_clicked_ state from WlRootsControlUnitMgr touch handling.
• Streamline touch_down, touch_move, and touch_up to directly forward pointer events to the Wayland client without additional state or coordinate logic.

[sourcery-ai]

Hey - 我给出了一些整体性的反馈：

• 在 touch_up 中，可以考虑为 (0, 0) 坐标添加一个简短的注释，或者使用具名常量，以便让后续阅读代码的人清楚这些值在 Ended 阶段是有意不使用的，而不是真实的位置。

给 AI Agents 的提示

Please address the comments from this code review:

## Overall Comments
- In `touch_up`, consider adding a brief comment or using a named constant for the `(0, 0)` coordinates to make it clear to future readers that these values are intentionally unused by the `Ended` phase and not a real position.

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Original comment in English

Hey - I've left some high level feedback:

• In touch_up, consider adding a brief comment or using a named constant for the (0, 0) coordinates to make it clear to future readers that these values are intentionally unused by the Ended phase and not a real position.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `touch_up`, consider adding a brief comment or using a named constant for the `(0, 0)` coordinates to make it clear to future readers that these values are intentionally unused by the `Ended` phase and not a real position.

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