doc(Dropdown): custom content use ButtonTemplate

[ArgoZhang]

custom content use ButtonTemplate

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 #5189

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

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces a new ButtonTemplate feature to the Dropdown component, allowing for custom button content. It also includes minor updates to the sample page, adding a new demo for the ButtonTemplate feature and updating existing Dropdown usages to self-close.

Class diagram showing Dropdown component changes

classDiagram
    class Dropdown {
        +TValue Value
        +IEnumerable<TValue> Items
        +bool IsFixedButtonText
        +string FixedButtonText
        +RenderFragment ButtonTemplate
    }
    note for Dropdown "Added ButtonTemplate for custom content"

Loading

File-Level Changes

Change	Details	Files
Added ButtonTemplate feature to the Dropdown component.	Added a new demo showcasing the ButtonTemplate feature. The ButtonTemplate allows users to customize the dropdown button content.	src/BootstrapBlazor.Server/Components/Samples/Dropdowns.razor
Updated Dropdown usages to self-close.	All Dropdown components in the sample page are now self-closing.	src/BootstrapBlazor.Server/Components/Samples/Dropdowns.razor
Added localization keys for the new ButtonTemplate demo.	Added 'ButtonTemplateTitle' and 'ButtonTemplateIntro' keys to both en-US and zh-CN locale files.	src/BootstrapBlazor.Server/Locales/en-US.json src/BootstrapBlazor.Server/Locales/zh-CN.json

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[sourcery-ai]

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

Overall Comments:

• Please include the localization changes for en-US.json and zh-CN.json files to support the new ButtonTemplate feature

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 (7b1a2f2) to head (f054a5a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5196   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          634       634           
  Lines        28169     28169           
  Branches      4053      4053           
=========================================
  Hits         28169     28169           

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