fix: Modify the background transparency of the account creation screen

[leibn123]

1.修改添加新用户界面的背景透明度问题

Summary by Sourcery

Enhancements:

• Add a full-window transparent rectangle with behind-window blur to the account creation dialog and set the dialog window color to transparent for consistent themed appearance.

[deepin-ci-robot]

Hi @leibn123. Thanks for your PR. 😃

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[sourcery-ai]

Reviewer's Guide

Adjusts the CreateAccountDialog background to be fully transparent and applies a styled behind-window blur layer that respects light/dark themes and non-blur fallbacks.

Flow diagram for blendColor selection in StyledBehindWindowBlur

flowchart TD
  Start([Start]) --> CheckValid{valid?}
  CheckValid -->|Yes| UseBlurColors["DS.Style.control.selectColor(dialog.palette.window,<br>Qt.rgba(1, 1, 1, 0.8),<br>Qt.rgba(0.06, 0.06, 0.06, 0.8))"]
  CheckValid -->|No| UseFallbackColors["DS.Style.control.selectColor(undefined,<br>DS.Style.behindWindowBlur.lightNoBlurColor,<br>DS.Style.behindWindowBlur.darkNoBlurColor)"]
  UseBlurColors --> End([blendColor set])
  UseFallbackColors --> End

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File-Level Changes

Change	Details	Files
Make the dialog window and its background fully transparent and replace the default background with a custom blurred, theme-aware rectangle.	Set the dialog window color to transparent to remove the default opaque background. Add a DialogTitleBar header explicitly referencing the dialog icon. Introduce a full-window Rectangle attached to dialog.contentItem, positioned to cover the entire window including margins and title bar, with transparent fill and z-order behind content. Add a D.StyledBehindWindowBlur inside the Rectangle, filling it and computing blendColor based on blur validity and current palette, with light/dark theme fallbacks when blur is not available. Preserve the original ColumnLayout content and dialog structure with only closing brace formatting adjusted.	src/plugin-accounts/qml/CreateAccountDialog.qml

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[sourcery-ai]

Hey - I've left some high level feedback:

• The full-window Rectangle uses hard-coded x/y/width/height offsets based on DS.Style constants; consider using anchors (e.g., anchors.fill with appropriate margins) so the blur layer automatically tracks layout or style changes and window resizes.
• The Rectangle is parented to dialog.contentItem but positioned using dialog.width/height and negative offsets; double-check whether setting the parent to the dialog itself (or anchoring to the contentItem) would be simpler and less fragile than mixing global and content coordinates.
• The new D.DialogTitleBar header overrides any default header; verify that any existing title bar behaviors (buttons, drag, shortcuts) are preserved or explicitly configured to avoid unexpected changes in window controls.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The full-window Rectangle uses hard-coded x/y/width/height offsets based on DS.Style constants; consider using anchors (e.g., anchors.fill with appropriate margins) so the blur layer automatically tracks layout or style changes and window resizes.
- The Rectangle is parented to dialog.contentItem but positioned using dialog.width/height and negative offsets; double-check whether setting the parent to the dialog itself (or anchoring to the contentItem) would be simpler and less fragile than mixing global and content coordinates.
- The new D.DialogTitleBar header overrides any default header; verify that any existing title bar behaviors (buttons, drag, shortcuts) are preserved or explicitly configured to avoid unexpected changes in window controls.

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[mhduiy]

加一个空行

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: leibn123, mhduiy

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Details

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• debian/deepin/OWNERS

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[deepin-bot]

TAG Bot

New tag: 6.1.80
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #3153

[mhduiy]

后续需要在DTK增加一个blur接口去设置模糊, dialogwindow当前的设计只能如此