fix: remove SystemPalette and use hardcoded colors in sidebar

[kt286]

fix: 移除 SystemPalette，侧边栏使用硬编码颜色

使用系统调色板后，Windows 下切换深色模式时颜色不会变化

Summary by Sourcery

Use explicit theme-aware colors in sidebar components to keep their appearance stable across system theme changes.

Bug Fixes:

• Ensure sidebar colors remain consistent when switching between light and dark modes on Windows.

Enhancements:

• Replace system palette dependencies in sidebar titles and delegates with explicit theme-aware colors.

Chores:

• Update SPDX copyright attribution formatting for the sidebar item component.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kt286

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR removes usage of SystemPalette from sidebar QML components and replaces it with hardcoded, theme-aware colors for foreground text and placeholder text, to ensure correct color behavior when switching dark mode on Windows.

Flow diagram for sidebar text color selection logic

flowchart TD
    A[SidebarItemDelegate.checked] -->|true| B{DTK.themeType}
    A -->|false| C{DTK.themeType}

    B -->|ApplicationHelper.DarkType| D[foregroundColor = #FFFFFF]
    B -->|else| E[foregroundColor = #FFFFFF]

    C -->|ApplicationHelper.DarkType| F[foregroundColor = #B2F7F7F7]
    C -->|else| G[foregroundColor = #000000]

    H[SidebarItem.title placeholder] --> I{DTK.themeType}
    I -->|ApplicationHelper.DarkType| J[color = Qt.rgba 247 247 247 0.7]
    I -->|else| K[color = Qt.rgba 0 0 0 0.7]

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File-Level Changes

Change	Details	Files
Replace SystemPalette-based foreground text color in sidebar item delegate with hardcoded colors that branch on DTK.themeType.	Define foregroundColor as a computed property using DTK.themeType and checked state instead of systemPalette fields. Use white text for checked state regardless of theme type. Use a lighter RGBA-like hex color in dark mode and solid black in light mode for unchecked state. Remove the SystemPalette object and its Active colorGroup from the delegate.	src/music-player/musicbaseandsonglist/SideBarItemDelegate.qml
Replace SystemPalette-based placeholder text color in sidebar item with hardcoded theme-aware colors and remove palette object.	Set the title Text.color using a ternary branch on DTK.themeType with Qt.rgba values for dark and light mode. Remove the SystemPalette object and its Active colorGroup from the sidebar item container.	src/music-player/musicbaseandsonglist/SideBarItem.qml

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[deepin-bot]

TAG Bot

New tag: 7.0.64
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #765

[deepin-bot]

TAG Bot

New tag: 7.0.65
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #768

[deepin-bot]

TAG Bot

New tag: 7.0.66
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #779