refactor(Modal): add back/restoreBodyStyle function

[ArgoZhang]

Link issues

fixes #5543
[Please fill in the relevant Issue number after the # above, such as #42]
[请在上方 # 后面填写相关 Issue 编号，如 #42]

Summary By Copilot

This pull request includes refactoring of the Modal component in src/BootstrapBlazor/Components/Modal/Modal.razor.js to improve the handling of the document body style when showing and hiding modals. The most important changes include the introduction of helper functions to backup and restore the body style.

Refactoring of modal body style handling:

• src/BootstrapBlazor/Components/Modal/Modal.razor.js: Replaced inline style backup and restore logic with backupBodyStyle and restoreBodyStyle helper functions in modal.show, modal.hide, and dispose functions. [1] [2] [3]
• Added backupBodyStyle function to store the original body style in modal.originalStyle if it is not already set.
• Added restoreBodyStyle function to revert the body style to the original and delete modal.originalStyle if it is set.

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

Enhancements:

• Introduces helper functions backupBodyStyle and restoreBodyStyle to manage the document body style, improving code readability and maintainability.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request refactors the Modal component to improve the handling of the document body style when showing and hiding modals by introducing helper functions to backup and restore the body style.

Sequence diagram for hiding the modal

sequenceDiagram
    participant document
    participant modal

    document->>modal: modal.hide()
    activate modal
    modal->>modal: modal.modal.hide()
    modal->>modal: restoreBodyStyle(modal)
    alt modal.originalStyle is defined
        modal->>document: document.body.style.cssText = modal.originalStyle
        modal->>modal: delete modal.originalStyle
    end
    modal->>modal: invoke.invokeMethodAsync(modal.closeCallback)
    deactivate modal

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File-Level Changes

Change	Details	Files
Encapsulated the logic for backing up and restoring the document body style into separate functions.	Added backupBodyStyle function to store the original body style. Added restoreBodyStyle function to revert the body style to the original.	src/BootstrapBlazor/Components/Modal/Modal.razor.js
Refactored the modal.show, modal.hide, and dispose functions to use the new helper functions for managing the body style.	Replaced inline style backup logic in modal.show with backupBodyStyle function. Replaced inline style restore logic in modal.hide with restoreBodyStyle function. Replaced inline style restore logic in dispose with restoreBodyStyle function.	src/BootstrapBlazor/Components/Modal/Modal.razor.js

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5543	Add back/restoreBodyStyle function to the Modal component.	✅

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[sourcery-ai]

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

Overall Comments:

• Consider adding comments to the helper functions to explain their purpose.
• It might be clearer to use modal.originalStyle === undefined instead of modal.originalStyle ??= ... and modal.originalStyle !== undefined instead of modal.originalStyle.

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 (1381afe) to head (a81a345).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5544   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          649       649           
  Lines        29607     29607           
  Branches      4173      4173           
=========================================
  Hits         29607     29607           

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