fix: remove top padding when title is empty

[MyLeeJiEun]

1. Set topPadding to 0 when the dialog title is empty string
2. Apply default contentVMargin only when a title is present
3. Fix visual alignment issue for dialogs without titles

Log: Hide top padding for title-less dialogs to fix layout

fix: 无标题时移除顶部内边距

1. 当对话框标题为空时，将 topPadding 设为 0
2. 仅在有标题时应用默认的 contentVMargin
3. 修复无标题对话框的视觉对齐问题

Log: 无标题对话框隐藏顶部内边距以修复布局
PMS: BUG-362237

Summary by Sourcery

Bug Fixes:

• Remove top padding when dialog title is empty to fix visual misalignment of title-less dialogs.

[deepin-ci-robot]

Hi @MyLeeJiEun. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adjusts dialog window padding so that dialogs without a title have no top padding and keep the default vertical margin only when a title is present, fixing visual alignment issues.

Flow diagram for topPadding logic in DialogWindow

flowchart TD
    A[DialogWindow created or title changed] --> B{title === ""}
    B -- Yes --> C[Set topPadding = 0]
    B -- No --> D[Set topPadding = DS.Style.dialogWindow.contentVMargin]

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File-Level Changes

Change	Details	Files
Conditionally remove top padding for dialogs when the title is empty to fix layout alignment.	Bind topPadding to zero when the dialog title is an empty string Keep using the default dialogWindow content vertical margin when a non-empty title is present	qt6/src/qml/DialogWindow.qml

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mhduiy, MyLeeJiEun

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