fix(dock): raise dock to LayerOverlay on Wayland

[wjyrich]

背景

点击任务栏插件区图标（网络/音量等）弹出面板时，通知横幅(bubble)层级显示在面板上层，应展示在下层。

根因

• dock 面板：panels/dock/package/main.qml 设 DLayerShellWindow.layer: LayerTop
• 通知横幅(bubble)：panels/notification/bubble/package/main.qml 设 DLayerShellWindow.layer: LayerOverlay
• dock 弹窗（网络/音量等）作为 xdg_popup 经 zwlr_layer_surface_v1.get_popup() 挂到 dock 的 layer surface 上，继承 dock 的 LayerTop
• 按 wlr-layer-shell 协议层序 Background < Bottom < [normal] < Top < Overlay，Overlay 高于 Top，故 bubble(Overlay) 渲染在 dock 弹窗(继承 Top)之上 → 复现本 bug

修复方案

Wayland 下将 dock 升至 LayerOverlay，弹窗继承 Overlay 后同层「后映射者在上方」压过 bubble：

DLayerShellWindow.layer: Qt.platform.pluginName === "wayland" ? DLayerShellWindow.LayerOverlay : DLayerShellWindow.LayerTop

X11 维持 LayerTop——x11dlayershellemulation.cpp:110 会将 LayerOverlay 映射为 Notification 窗口类型，导致 deepin kwin 下 exclusionZone/strut 失效、KeepShowing 边缘预留回归。

回归核对

• 自动隐藏（treeland_window_overlap_checker）：按几何检测窗口重叠触发 SmartHide，与 dock 所在 layer 无关，不受影响 ✅
• 通知中心/OSD 同层叠放：三者本就 Overlay、本就在 dock 之上；改后同属 Overlay，按需映射仍晚于 dock，视觉效果与改前一致 ✅
• 多屏：TreeLandDockWakeUpArea 本就已是 LayerOverlay 先例，无异常 ✅
• X11 strut：维持 LayerTop（Dock 窗口类型），strut/边缘预留不变 ✅
• Treeland：未改动 ✅
• 仅验证 Qt6 链路 ✅

关联

• PMS: https://pms.uniontech.com/bug-view-373349.html
• multica issue: DDE-82

改动文件

• panels/dock/package/main.qml（1 行实质改动 + 行内注释）

Summary by Sourcery

Bug Fixes:

• Ensure dock popups appear above notification bubbles on Wayland by raising the dock to the overlay layer while preserving existing behavior on X11.

[deepin-ci-robot]

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[deepin-ci-robot]

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This pull-request has been approved by: wjyrich

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

On Wayland, the dock’s layer is raised from LayerTop to LayerOverlay so dock popups inherit Overlay and render above notification bubbles, while preserving existing X11 behavior and strut semantics.

File-Level Changes

Change	Details	Files
Adjust dock window layer selection by platform so Wayland dock (and its xdg_popups) render in LayerOverlay while X11 remains in LayerTop to avoid strut/exclusionZone regressions.	Change DLayerShellWindow.layer from a fixed LayerTop to a conditional expression based on Qt.platform.pluginName, using LayerOverlay on Wayland and LayerTop on non-Wayland (X11). Add inline comments explaining the Wayland layering rationale (bubble vs dock popups) and the X11 caveat where LayerOverlay is mapped to a Notification window type that breaks exclusionZone/strut in KeepShowing mode.	panels/dock/package/main.qml

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