doc(Select): update ShowSearch sample code

[ArgoZhang]

update ShowSearch sample code

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 #5240

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

New Features:

• Add a switch to toggle the search visibility in the Select component popover.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the ShowSearch sample code for the Select component to use a switch to control the ShowSearch property, and adjusts the search icon position.

Class diagram for Select component changes

classDiagram
  class Selects {
    -bool _showSearch
    -bool _showPopoverSearch
    -bool _isShowSearchClearable
    -bool _isClearable
  }
  class Select {
    +bool ShowSearch
    +bool IsPopover
  }
  Selects --> Select: uses

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File-Level Changes

Change	Details	Files
Updated the ShowSearch sample code to use a switch to control the ShowSearch property.	Added a switch to control the ShowSearch property of the Select component. Added a new boolean property _showPopoverSearch to the Selects.razor.cs file. Bound the switch to the _showPopoverSearch property. Passed the _showPopoverSearch property to the ShowSearch property of the Select component.	src/BootstrapBlazor.Server/Components/Samples/Selects.razor src/BootstrapBlazor.Server/Components/Samples/Selects.razor.cs
Adjusted the search icon position in the Select component.	Modified the $bb-select-search-icon-top variable from 15px to 17px.	src/BootstrapBlazor/wwwroot/scss/theme/bootstrapblazor.scss

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5240	Ensure ShowSearch works correctly when IsPopover is set to true	✅
#5240	Allow dynamic control of ShowSearch in popover mode	✅

Possibly linked issues

• bug(Select): Select component always show Search when IsPopover=true #5240: The PR fixes the issue by updating the ShowSearch sample code, addressing the problem of the search box not updating options.
• bug(Select): Select component always show Search when IsPopover=true #5240: The PR fixes the issue by updating the ShowSearch sample code to ensure consistent rendering after validation.
• bug(Select): Select component always show Search when IsPopover=true #5240: The PR fixes the issue by updating the ShowSearch sample code.

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[sourcery-ai]

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

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 (0099bd3) to head (d2e7739).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5241   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          637       637           
  Lines        28317     28317           
  Branches      4078      4078           
=========================================
  Hits         28317     28317           

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