feat(TreeView): add IsIncludeIndeterminateWhenGetCheckedItems parameter

[ArgoZhang]

Link issues

fixes #8450

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

Allow TreeView consumers to control whether indeterminate nodes are returned as checked items.

New Features:

• Add a TreeView parameter that optionally includes indeterminate nodes in the collection returned by GetCheckedItems().

Tests:

• Add coverage verifying GetCheckedItems() behavior with and without indeterminate nodes.

[sourcery-ai]

Reviewer's Guide

Adds an opt-in TreeView parameter that makes GetCheckedItems() include indeterminate nodes, preserves the existing checked-only default, and validates both modes with an AutoCheckParent tri-state unit test.

File-Level Changes

Change	Details	Files
Adds a configurable TreeView option controlling whether indeterminate nodes are returned by GetCheckedItems().	Introduces the IsIncludeIndeterminateWhenGetCheckedItems component parameter with a default of false and bilingual documentation. Refactors checked-item filtering to include both checked and indeterminate states when the option is enabled, while preserving checked-only behavior by default.	src/BootstrapBlazor/Components/TreeView/TreeView.razor.cs
Adds coverage for the new filtering behavior in tri-state checkbox scenarios.	Verifies the default excludes the indeterminate parent node. Verifies enabling the parameter includes both the indeterminate parent and checked child.	test/UnitTest/Components/TreeViewTest.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#8450	Add an IsIncludeIndeterminateWhenGetCheckedItems parameter to TreeView.	✅
#8450	Make GetCheckedItems() optionally include indeterminate nodes when the new parameter is enabled, while preserving the existing behavior by default.	✅
#8450	Provide automated test coverage for the new parameter and its default behavior.	✅

Possibly linked issues

• feat(TreeView): add IsIncludeIndeterminateWhenGetCheckedItems parameter #8450: The PR directly implements issue feat(TreeView): add IsIncludeIndeterminateWhenGetCheckedItems parameter #8450 by adding the parameter, behavior, documentation, and unit test.

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[bb-auto]

Auto approved by bb-auto

[sourcery-ai]

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

Sourcery assessment

Approved.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (43a563f) to head (328c148).

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #8451   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          776       776           
  Lines        35067     35069    +2     
=========================================
+ Hits         35067     35069    +2     

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

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