fix(WinBox): body should be compatible with dark mode

[ArgoZhang]

body should be compatible with dark mode

Summary of the changes (Less than 80 chars)

简单描述你更改了什么, 不超过80个字符；如果有关联 Issue 请在下方填写相关编号

Description

fixes #4594

Regression?

• Yes
• No

[If yes, specify the version the behavior has regressed from]

[是否影响老版本]

Risk

• High
• Medium
• Low

[Justify the selection above]

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Bug Fixes:

• Ensure WinBox body is compatible with dark mode.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses a dark mode compatibility issue in the WinBox component by updating the body styling. The changes appear to be minimal but focused on improving the user interface consistency when dark mode is enabled.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated WinBox body styling for dark mode compatibility	Modified body styling to support dark mode theme	src/BootstrapBlazor.Server/BootstrapBlazor.Server.csproj

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4594	Fix WinBox component's body background color to be compatible with dark mode by removing the hardcoded #fff background	❌	While the PR title and description indicate this is being addressed, the provided diff does not show the actual CSS changes needed to fix the background color issue in the WinBox component.

Possibly linked issues

• bug(WinBox): 组件 css wb-body background 给了#fff 导致组件主题无效 #4594: The PR fixes the wb-body background issue by making it compatible with dark mode.

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes - here's some feedback:

Overall Comments:

• The PR is missing the actual code changes. Please include the modifications made to fix the dark mode compatibility issue.
• Please provide more details about the changes: what specifically was modified to support dark mode, and include steps to verify the fix works correctly.
• The PR template is incomplete - please fill in the risk assessment justification and ensure all relevant checkboxes are reviewed.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (7c65010) to head (19b7c75).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4595   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          620       620           
  Lines        27383     27383           
  Branches      3919      3919           
=========================================
  Hits         27383     27383           

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