doc(RadioList): add sample code for AutoSelectFirstWhenValueIsNull

[ArgoZhang]

add sample code for AutoSelectFirstWhenValueIsNull

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 #5364

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 sample code for the AutoSelectFirstWhenValueIsNull parameter in the RadioList component and fix the issue where the first item was not selected when the value was null.

Bug Fixes:

• Fix issue where RadioList component would not select the first item when the value is null and AutoSelectFirstWhenValueIsNull is set to true.

Documentation:

• Add sample code demonstrating the usage of the AutoSelectFirstWhenValueIsNull parameter for the RadioList component.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a new demo to the RadioList component showcasing the AutoSelectFirstWhenValueIsNull feature. It also updates the documentation to include the new property.

Updated class diagram for Radios component

classDiagram
  class Radios {
    -IEnumerable~SelectedItem~ DemoValues
    -IEnumerable~SelectedItem~ AutoSelectValues
    -IEnumerable~SelectedItem~ DisableValues
    +OnInitialized()
    +GetAttributes()
  }
  Radios -- SelectedItem : has
  note for Radios "Added AutoSelectValues property and updated OnInitialized method to include AutoSelectValues"

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File-Level Changes

Change	Details	Files
Added a new demo showcasing the AutoSelectFirstWhenValueIsNull feature of the RadioList component.	Added AutoSelectValues property to the Radios.razor.cs file. Added a new DemoBlock in Radios.razor to demonstrate the AutoSelectFirstWhenValueIsNull feature. Added localization resources for the new demo in both en-US.json and zh-CN.json.	src/BootstrapBlazor.Server/Components/Samples/Radios.razor.cs src/BootstrapBlazor.Server/Components/Samples/Radios.razor src/BootstrapBlazor.Server/Locales/en-US.json src/BootstrapBlazor.Server/Locales/zh-CN.json
Added a new attribute to the GetAttributes method in Radios.razor.cs.	Added a new AttributeItem for the AutoSelectFirstWhenValueIsNull property. Added description and default value for the AutoSelectFirstWhenValueIsNull property.	src/BootstrapBlazor.Server/Components/Samples/Radios.razor.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5364	Enable the Radio component to support a 'no one checked' state when the TValue is nullable and the value is null.	❌	The PR only adds documentation and sample code for the AutoSelectFirstWhenValueIsNull property. It does not modify the Radio component to allow for a 'no one checked' state when the value is null. The sample code demonstrates how to use the AutoSelectFirstWhenValueIsNull property, but it doesn't address the core issue of supporting a nullable value resulting in no selection.
#5364	Provide a way to display a radio button group with no default selection when the bound value is null.	❌	The PR adds documentation and a demo, but does not change the underlying component to allow a null value to result in no selection. The demo shows how to prevent auto-selection, but not how to handle a null value to achieve the desired 'no one checked' state.

Possibly linked issues

• feat(radio): support no one checked state #5364: The PR adds a sample code for the new feature introduced to fix the issue.
• feat(radio): support no one checked state #5364: The PR fixes the issue by adding sample code demonstrating the AutoSelectFirstWhenValueIsNull property of the RadioList component.
• feat(radio): support no one checked state #5364: The PR fixes this issue by adding sample code demonstrating the AutoSelectFirstWhenValueIsNull property for RadioList.

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[sourcery-ai]

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

Overall Comments:

• Consider adding a code snippet to the demo to showcase the AutoSelectFirstWhenValueIsNull functionality.

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 (6616a6f) to head (ef79377).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5367   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          644       644           
  Lines        29218     29218           
  Branches      4125      4125           
=========================================
  Hits         29218     29218           

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