feat(SelectRegion): add SelectRegion component

[ArgoZhang]

Link issues

fixes #6902

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

Add a new SelectRegion component with service registration, localization support, menu integration, styling adjustment, and sample demonstration

New Features:

• Introduce SelectRegion component with a sample page for region selection
• Register IRegionService for providing region data
• Add "Region" entry in the demo menu

Enhancements:

• Add "popover-region" CSS class for region popovers
• Add localization entries for the Region component in en-US and zh-CN JSON files

Documentation:

• Update documentation JSON to include Region component usage

[sourcery-ai]

Reviewer's Guide

This PR introduces the SelectRegion component by registering its supporting service, integrating a navigation entry, providing a demo page with localization, alongside minor refactors in JSON localization handling and a styling tweak.

Class diagram for the new Regions demo component

classDiagram
    class Regions {
        - string _value
    }

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File-Level Changes

Change	Details	Files
Integrate SelectRegion feature with DI, menu, sample, and localization	Register IRegionService in the BootstrapBlazor DI container Add a new 'Region' item to the demo navigation menu Create Regions.razor and Regions.razor.cs sample page using Add Region-related keys to en-US.json, zh-CN.json, and docs.json	ServiceCollectionSharedExtensions.cs MenusLocalizerExtensions.cs Components/Samples/Regions.razor Components/Samples/Regions.razor.cs Locales/en-US.json Locales/zh-CN.json docs.json
Refactor JSON localizer merge method and cache variable names	Rename MegerResolveLocalizers to MergeResolveLocalizers Correct _allLocalizerdStrings to _allLocalizedStrings Update all corresponding method calls and local variable references	Localization/Json/JsonStringLocalizer.cs
Add custom CSS class for region popover	Include 'popover-region' in CustomClassString builder	Components/DateTimePicker/PopoverDropdownBase.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6902	Add a SelectRegion component to the codebase.	✅

Possibly linked issues

• feat(SelectRegion): add SelectRegion component #6902: The PR adds the SelectRegion component as described in the issue, including new razor pages and service extensions.
• feat(SelectRegion): add SelectRegion component #6902: The PR adds the SelectRegion component, fulfilling the request for an administrative region selection component in issue 6902.

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[Copilot]

Pull Request Overview

This PR adds a SelectRegion component for administrative region selection, fixing issue #6902. The implementation includes spelling corrections in localization code, integration of the Region service, and demonstration pages.

• Corrected spelling errors in JsonStringLocalizer method and field names
• Added Region component integration with localization and demonstration pages
• Added CSS class for popover region styling

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
JsonStringLocalizer.cs	Fixed spelling errors in method and field names
PopoverDropdownBase.cs	Added "popover-region" CSS class for styling
docs.json	Added region route mapping
zh-CN.json	Added Chinese localization for Region component
en-US.json	Added English localization for Region component
ServiceCollectionSharedExtensions.cs	Registered Region service
MenusLocalizerExtensions.cs	Added Region menu item
Regions.razor.cs	Created demo component code-behind
Regions.razor	Created demo component template
BootstrapBlazor.Server.csproj	Added BootstrapBlazor.Region package reference

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[sourcery-ai]

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

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a9981ed) to head (b9c23a6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6903   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          739       739           
  Lines        31772     31773    +1     
  Branches      4467      4467           
=========================================
+ Hits         31772     31773    +1     

Flag	Coverage Δ
BB	100.00% <100.00%> (?)

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