feat: add clear button to notification items

[wjyrich]

1. Added clearButton property to OverlapNotify component for reusability
2. Implemented clear button functionality in NotifyStaging for individual notification removal
3. The clear button triggers removal animation and calls remove callback
4. Maintains existing clean all functionality while adding per-item clear capability

feat: 为通知项添加清除按钮

1. 在 OverlapNotify 组件中添加 clearButton 属性以提高可重用性
2. 在 NotifyStaging 中实现单个通知的清除按钮功能
3. 清除按钮触发移除动画并调用移除回调函数
4. 保留现有的全部清除功能，同时添加单个项目的清除能力

Pms: BUG-336149

Summary by Sourcery

Introduce a customizable clearButton on notification items to enable per-notification removal while preserving the existing clean-all behavior

New Features:

• Expose a clearButton property on OverlapNotify for customizable clear actions
• Add a per-item clear button in NotifyStaging to remove individual notifications with animation and callback

Enhancements:

• Retain existing clean-all functionality alongside the new per-item clear capability

[sourcery-ai]

Reviewer's Guide

This PR enhances notification components by introducing a reusable clearButton property in OverlapNotify (refactoring its inline usage) and adding a per-item clear button in NotifyStaging to trigger removal animations and callbacks, while retaining the existing bulk-clear capability.

Sequence diagram for individual notification removal via clear button

sequenceDiagram
    actor User
    participant "NotifyStaging"
    participant "OverlapNotify"
    participant "SettingActionButton"
    User->>"SettingActionButton": Click clear button
    "SettingActionButton"->>"OverlapNotify": Trigger removedCallback
    "OverlapNotify"->>"OverlapNotify": Set state to "removing" (animate)
    "OverlapNotify"->>"NotifyStaging": Call remove callback
    "NotifyStaging"->>"NotifyStaging": Remove notification from model

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Class diagram for OverlapNotify and NotifyStaging clearButton changes

classDiagram
    class OverlapNotify {
        +bool enableDismissed
        +var removedCallback
        +Component clearButton
        +signal expand()
    }
    class NotifyStaging {
        +clearButton: SettingActionButton
    }
    OverlapNotify <|-- NotifyStaging: uses
    OverlapNotify o-- AnimationSettingButton: clearButton (previously inline)
    NotifyStaging o-- SettingActionButton: clearButton (per-item)
    AnimationSettingButton <|-- SettingActionButton

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File-Level Changes

Change	Details	Files
Introduce and leverage a configurable clearButton property in OverlapNotify	Add clearButton property with default AnimationSettingButton Encapsulate click handler to set removedCallback and trigger ‘removing’ state Replace inline clearButton declaration with root.clearButton reference	panels/notification/center/OverlapNotify.qml
Implement individual notification clear button in NotifyStaging	Add clearButton SettingActionButton with clean-alone icon Wire click handler to set removal callback and animation state on overlapNotify	panels/notification/center/NotifyStaging.qml

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