fix: adjust menu item height, separator spacing and dark mode

[zqq-dora]

Summary

1. Reduce menu item height from 30px to 26px for compact layout
2. Add menu item padding property (3px) to constrain content height
3. Reduce menu top/bottom padding from 8px to 6px
4. Set separator top/bottom padding to 3px for proper spacing
5. Add normalDark color for separator to fix invisible separator in dark mode
6. Add palette: D.DTK.palette binding in Menu.qml to fix greyed-out highlight color when popup window is not active
7. Disable hover highlight for disabled menu items in MenuItem.qml

Files Changed

• qt6/src/qml/FlowStyle.qml — menu height/padding/separator style values and dark mode separator color
• qt6/src/qml/Menu.qml — palette binding fix
• qt6/src/qml/MenuItem.qml — padding source and disabled highlight fix

Root Cause

• Separator in dark mode: The lineColor palette in FlowStyle.qml was missing the normalDark property, so the separator fell back to the light-mode color (Qt.rgba(0, 0, 0, 0.1)) which is nearly invisible on dark backgrounds.
• Greyed-out highlight: Menu.qml was missing the palette: D.DTK.palette binding that Popup.qml already had. Without it, the highlight color used the default window palette instead of the DTK theme palette when the popup window was not active.
• Disabled item highlight: MenuItem.qml applied the highlighted state based purely on hovered, without checking enabled, so disabled items still showed a hover highlight effect.

概述（中文）

1. 菜单项高度从 30px 调整为 26px，使布局更紧凑
2. 添加菜单项 padding 属性（3px），限制内容高度不超出 26px
3. 菜单上下边距从 8px 调整为 6px
4. 分割线上下间距设置为 3px，保证合理的间距
5. 添加分割线深色模式颜色，修复深色模式下分割线不可见的问题
6. Menu.qml 中添加 palette 绑定，修复菜单高亮颜色置灰的问题
7. MenuItem.qml 中禁用项不再显示 hover 高亮效果

根本原因

• 深色模式分割线不可见：FlowStyle.qml 中 lineColor 调色板缺少 normalDark 属性，导致深色模式下分割线回退使用浅色模式颜色（Qt.rgba(0, 0, 0, 0.1)），在深色背景上几乎不可见。
• 高亮颜色置灰：Menu.qml 缺少 palette: D.DTK.palette 绑定（Popup.qml 中已有此绑定）。缺少该绑定时，弹出窗口非激活状态下高亮颜色使用默认窗口调色板而非 DTK 主题调色板。
• 禁用项高亮：MenuItem.qml 中 highlighted 状态仅基于 hovered 判断，未检查 enabled，导致禁用项仍显示 hover 高亮效果。

Summary by Sourcery

Improve menu layout and theming while correcting separator, popup highlight, and disabled-item hover behavior.

Bug Fixes:

• Fix separator visibility in dark mode by applying an appropriate dark-theme separator color.
• Use the DTK palette for menu popups so inactive menu highlights retain the theme color.
• Prevent disabled menu items from displaying hover highlights.

Enhancements:

• Make menus more compact by reducing item height and menu spacing while adding consistent item and separator padding.

[deepin-ci-robot]

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR compacts menu layout, adds consistent separator spacing and dark-mode coloring, binds menus to the DTK palette to preserve highlight colors in inactive popups, and suppresses hover highlighting for disabled items.

File-Level Changes

Change	Details	Files
Tighten menu and separator layout through centralized style values.	Reduce menu item height and introduce dedicated item padding. Reduce menu top padding and add separator line spacing.	qt6/src/qml/FlowStyle.qml qt6/src/qml/MenuItem.qml
Correct separator rendering across light and dark themes.	Define a light contrasting separator color for dark mode via the palette's normalDark value.	qt6/src/qml/FlowStyle.qml
Ensure menu visuals use the DTK theme and respect disabled state.	Bind the menu to the DTK palette for consistent popup highlight colors. Prevent disabled items from entering the highlighted state.	qt6/src/qml/Menu.qml qt6/src/qml/MenuItem.qml

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: 18202781743, zqq-dora

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