doc(CodeEditor): add sample cdoe for CodeEditor

[ArgoZhang]

Link issues

fixes #6487

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

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

Update the CodeEditor sample to provide initial code snippets, simplify state handling with bindable selects, and display a live editor demo

Enhancements:

• Initialize the CodeEditor sample with default code, language, and theme values
• Switch language and theme selects to use @bind-Value instead of manual change handlers
• Remove the redundant theme change handler method
• Add a live CodeEditor preview inside a styled container in the sample view

[sourcery-ai]

Reviewer's Guide

This PR enriches the CodeEditor demo with default sample code snippets, replaces nullable properties with initialized private fields, streamlines selection handlers, and updates the markup to bind the new fields and render a live editor preview.

Class diagram for updated CodeEditors component

classDiagram
    class CodeEditors {
        - string _code = "sample code"
        - string _language = "CSharp"
        - string _theme = "vs"
        + Task OnSelectedItemChanged(SelectedItem item)
    }

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File-Level Changes

Change	Details	Files
Initialize default code, language, and theme via private fields	Introduce _code, _language, and _theme fields with initial C# snippet and theme values Remove nullable Code, Language, and Theme properties	CodeEditors.razor.cs
Refactor OnSelectedItemChanged handler	Update only _code based on selected language Remove state change calls for Language and Theme	CodeEditors.razor.cs
Remove OnThemeSelectedItemChanged method	Delete obsolete theme selection logic and state updates	CodeEditors.razor.cs
Update demo markup to bind new fields and show live editor	Switch Select components to use @bind-Value for _language and _theme Adjust Pre tag to display binding expressions for new fields Add a live CodeEditor component preview with bound fields	CodeEditors.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6487	Add sample code for the CodeEditor component in the documentation or demo.	✅

Possibly linked issues

• doc(CodeEditor): add sample cdoe for CodeEditor #6487: PR adds sample code for CodeEditor component, specifically for C#, JS, JSON, and Razor, directly addressing issue doc(CodeEditor): add sample cdoe for CodeEditor #6487.

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes and they look great!

Prompt for AI Agents

Please address the comments from this code review:
## Individual Comments

### Comment 1
<location> `src/BootstrapBlazor.Server/Components/Samples/CodeEditors.razor:30` </location>
<code_context>
         </div>
         <div class="col-12">
-            <Pre>&lt;CodeEditor Value="@@Code" Language="@@Language" Theme="@@Theme" OnValueChanged="OnValueChanged" /&gt;</Pre>
+            <Pre>&lt;CodeEditor Value="@@_code" Language="@@_language" Theme="@@_theme" /&gt;</Pre>
+        </div>
+        <div class="col-12">
</code_context>

<issue_to_address>
The Pre block now uses the new backing fields, but the double @ may be unnecessary.

Ensure that using @@_code, @@_language, and @@_theme achieves the intended output. Use a single @ for interpolation, or verify proper escaping if displaying as a string.
</issue_to_address>

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[sourcery-ai]

nitpick: The Pre block now uses the new backing fields, but the double @ may be unnecessary.

Ensure that using @@_code, @@_language, and @@_theme achieves the intended output. Use a single @ for interpolation, or verify proper escaping if displaying as a string.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6b73e28) to head (692d6e2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6488   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          714       714           
  Lines        31383     31383           
  Branches      4431      4431           
=========================================
  Hits         31383     31383           

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