feat(Collapse): add HeaderTemplate parameter

[ArgoZhang]

add HeaderTemplate parameter

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 #4754

Regression?

• Yes
• No

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

[是否影响老版本]

Risk

• High
• Medium
• Low

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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

Add a HeaderTemplate parameter to the Collapse component to enable header customization, refactor CSS for improved styling, and update tests to cover the new feature.

New Features:

• Introduce a HeaderTemplate parameter to the Collapse component, allowing customization of the header display content.

Enhancements:

• Refactor the Collapse component's CSS to improve styling and layout, including changes to the accordion header and button classes.

Tests:

• Add a new test case to verify the functionality of the HeaderTemplate parameter in the Collapse component.

[sourcery-ai]

Reviewer's Guide by Sourcery

This PR adds a new HeaderTemplate parameter to the Collapse component, allowing for customized header content. The implementation includes UI styling updates, new localization entries, and refactoring of the header rendering logic to support the template feature.

Class diagram for the updated Collapse component

classDiagram
    class Collapse {
        static string? GetHeaderButtonClassString(CollapseItem item)
        static string? GetItemIconString(CollapseItem item)
        static string? GetHeaderClassString(CollapseItem item)
        static string? GetClassString(bool collapsed)
    }
    note for Collapse "Refactored to support HeaderTemplate and updated styling methods"

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File-Level Changes

Change	Details	Files
Added HeaderTemplate parameter and related properties to CollapseItem component	Added HeaderTemplate parameter to allow custom header content Added HeaderClass parameter for custom header styling Updated component documentation and parameter descriptions Fixed typo in Collapse property name	src/BootstrapBlazor/Components/Collapse/CollapseItem.cs
Refactored Collapse component's header rendering logic	Replaced Button component with custom header structure Added conditional rendering for HeaderTemplate content Implemented new CSS classes for header styling Added icon rendering support in header	src/BootstrapBlazor/Components/Collapse/Collapse.razor
Updated SCSS styling for accordion headers	Restructured accordion header layout using flexbox Added new styling for header states (collapsed/expanded) Updated border radius handling for first and last items Removed redundant button color styles	src/BootstrapBlazor/Components/Collapse/Collapse.razor.scss
Added demo and documentation for HeaderTemplate feature	Added new demo section for HeaderTemplate usage Added attribute documentation for new parameters Updated localization entries for both English and Chinese Added example with Select component in header	src/BootstrapBlazor.Shared/Components/Samples/Collapses.razor src/BootstrapBlazor.Shared/Components/Samples/Collapses.razor.cs src/BootstrapBlazor.Shared/Locales/en-US.json src/BootstrapBlazor.Shared/Locales/zh-CN.json

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#4754	Add HeaderTemplate parameter to Collapse component to allow customization of header content	✅

Possibly linked issues

• feat(Collapse): Collapse title header template - RenderFragment #4754: The PR implements the HeaderTemplate feature requested in the issue, enabling header customization.

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[ArgoZhang]

@sourcery-ai review

[sourcery-ai]

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

Overall Comments:

• Consider maintaining consistent documentation language (either English or Chinese) throughout the codebase for better maintainability.
• Unrelated changes (like removing #if NET9_0_OR_GREATER) should be moved to a separate pull request to maintain clear change history.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟡 Complexity: 1 issue found
• 🟢 Documentation: all looks good

---

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[ArgoZhang]

@sourcery-ai review

[sourcery-ai]

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

Overall Comments:

• Consider adding more detailed documentation for the HeaderTemplate parameter, including usage examples and limitations. This will help other developers understand how to properly implement custom headers.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟡 Complexity: 1 issue found
• 🟢 Documentation: all looks good

---

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• X
• Mastodon
• LinkedIn
• Facebook

_{Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (abfd210) to head (91e7b3d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #4763   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          620       620           
  Lines        27407     27424   +17     
  Branches      3923      3925    +2     
=========================================
+ Hits         27407     27424   +17     

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