fix(dock): eliminate several QML runtime/compile warnings

[Ivy233]

1. ShellSurfaceItemProxy: set Connections.ignoreUnknownSignals so the cursorShapeRequested handler no longer warns for surfaces lacking the signal.
2. TaskManager: replace the deprecated ListView.onAdd NumberAnimation object-to-signal-handler assignment with a declarative add Transition.
3. TaskManager: break the implicitWidth/implicitHeight binding loop by returning the dock size directly in the spanning layout direction.
4. AppItem/DragItem/ActionLegacyTrayPluginDelegate: pass an explicit target size to grabToImage to avoid the Ignoring sourceSize request warning.
5. OverlapNotify: guard the panelShown lookup so an undefined ListView.view no longer assigns undefined to a bool property.
6. trayitempositionmanager: register the DropIndex gadget as dropIndex lowercase so qmltyperegistrar stops warning about its value-type name.

Log: fix multiple QML warnings reported by journalctl/qmltyperegistrar

Influence:

1. Verify dock shell surface cursor shape handling still works
2. Verify task manager item add animation still plays
3. Verify dock auto-size layout is unchanged
4. Verify drag image rendering for dock and tray items
5. Verify notification overlap animation initialization

fix(dock): 消除任务栏与通知中心若干 QML 运行时/注册告警

1. ShellSurfaceItemProxy：为 Connections 设置 ignoreUnknownSignals， 使 cursorShapeRequested 处理器对缺少该信号的 surface 不再告警。
2. TaskManager：将弃用的 ListView.onAdd NumberAnimation 对象赋值给 信号处理器的写法改为声明式 add Transition。
3. TaskManager：在占满布局方向直接返回 dock 尺寸，打断 implicitWidth/implicitHeight 绑定环。
4. AppItem/DragItem/ActionLegacyTrayPluginDelegate：为 grabToImage 传入 显式目标尺寸，避免 Ignoring sourceSize request 告警。
5. OverlapNotify：对 panelShown 查询加空值守卫，避免未定义的 ListView.view 将 undefined 赋给 bool 属性。
6. trayitempositionmanager：将 DropIndex gadget 注册为 dropIndex 小写，使 qmltyperegistrar 不再告警其值类型名。

Log: 修复 journalctl/qmltyperegistrar 报告的多项 QML 告警

Influence:

1. 验证任务栏 shell surface 光标形状处理仍正常
2. 验证任务管理器条目添加动画仍播放
3. 验证任务栏自适应尺寸布局不变
4. 验证任务栏与托盘条目拖拽图像渲染
5. 验证通知重叠动画初始化

PMS: TASK-394379

Summary by Sourcery

Remove QML runtime and type-registration warnings across dock, task manager, tray, and notification components while preserving existing behavior.

Bug Fixes:

• Eliminate QML runtime warnings caused by unknown shell-surface signals, invalid image capture sizing, undefined notification view state, and task manager binding loops.
• Preserve task item add animations while removing deprecated signal-handler animation syntax.

Enhancements:

• Prevent dock sizing and tray layout updates from triggering binding loops during layout changes.
• Register the tray drop-index value type with a compliant lowercase QML name.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Ivy233

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[sourcery-ai]

Reviewer's Guide

Removes several QML runtime and registration warnings by making signal and view lookups safe, replacing the deprecated task-item add animation syntax, breaking dock sizing binding loops, supplying explicit drag-image sizes, and correcting the tray drop-index QML type name while preserving existing behavior.

Flow diagram for warning-safe dock and notification behavior

flowchart LR
    ShellSurface[Shell surface] -->|cursorShapeRequested| Proxy[ShellSurfaceItemProxy]
    Proxy -->|ignore unknown signals| SafeSignal[Warning-free signal handling]
    TaskModel[Task manager model] --> ListView[ListView]
    ListView -->|add Transition| AddAnimation[Scale and opacity animation]
    DockLayout[Dock layout] -->|useColumnLayout| DockSize[Return dockSize directly]
    DockLayout -->|other direction| ContentSize[Compute content-based size]
    DragItem[Dock or tray item] -->|grabToImage(width,height)| DragImage[Explicit-size drag image]
    ListViewView[ListView.view] -->|exists| Overlap[panelShown lookup]
    ListViewView -->|missing| Disabled[Animation disabled]
    DropIndex[DropIndex gadget] -->|QML_NAMED_ELEMENT| dropIndex[dropIndex value type]

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File-Level Changes

Change	Details	Files
Make shell-surface signal handling tolerant of surface implementations that do not expose the cursor-shape signal.	Enable unknown-signal tolerance on the surface Connections object. Verify cursor shape updates still work when the signal is available.	panels/dock/ShellSurfaceItemProxy.qml
Replace warning-prone task manager sizing and insertion animation patterns with binding-safe declarative implementations.	Return the dock size directly in the non-spanning implicit dimension to break the binding loop. Move item add animation from ListView.onAdd to an add Transition while preserving scale and opacity animation.	panels/dock/taskmanager/package/TaskManager.qml
Provide explicit dimensions for drag-image captures across dock and tray delegates.	Pass each item's current width and height to grabToImage. Preserve existing drag image assignment and activation behavior.	panels/dock/taskmanager/package/AppItem.qml panels/dock/tray/package/ActionLegacyTrayPluginDelegate.qml panels/dock/tray/quickpanel/DragItem.qml
Guard notification overlap animation initialization when the delegate is not attached to a ListView.	Use a null-safe ListView.view lookup with false as the fallback value.	panels/notification/center/OverlapNotify.qml
Register the tray drop-index value type with the lowercase QML name expected by the type registrar.	Replace automatic element naming with QML_NAMED_ELEMENT(dropIndex).	panels/dock/tray/trayitempositionmanager.h

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