feat(Step): add CurrentStepIndex property

[momijijin]

Link issues

fixes #6315

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

New Features:

• Add read-only CurrentStepIndex property to expose the component's current step index in real time

[bb-auto]

Thanks for your PR, @momijijin. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[sourcery-ai]

Reviewer's Guide

Introduced a public read-only property to expose the internal _currentStepIndex field.

File-Level Changes

Change	Details	Files
Add CurrentStepIndex property to expose step index	Declared public int CurrentStepIndex returning _currentStepIndex Included XML comment for documentation	src/BootstrapBlazor/Components/Step/Step.razor.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6315	Provide a way to access the real-time value of the _currentStepIndex property without relying on the Prev() and Next() methods.	✅
#6315	Introduce a new property, CurrentStepIndex, to expose the real-time value of _currentStepIndex instead of modifying the existing StepIndex property.	✅

Possibly linked issues

• feat(Step): add CurrentStepIndex property #6315: The PR adds the CurrentStepIndex property as requested in the issue to obtain the real-time _currentStepIndex value.

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[sourcery-ai]

Hey @momijijin - 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 99.99%. Comparing base (618b956) to head (4f6a39a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6316   +/-   ##
=======================================
  Coverage   99.99%   99.99%           
=======================================
  Files         717      717           
  Lines       31557    31558    +1     
  Branches     4457     4457           
=======================================
+ Hits        31556    31557    +1     
  Partials        1        1           

Flag	Coverage Δ
BB	99.99% <100.00%> (?)

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