[Tabs] Call HandleOnTabChange when changing to a tab through the menu

[vnbaaij]

This pull request introduces a small change to the tab change handler in FluentTabs.razor.cs. Now, after invoking the OnTabSelect event, it also calls HandleOnTabChangedAsync, ensuring any additional logic tied to tab changes is executed.

Fix #4549

[github-actions]

✅ All tests passed successfully

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[github-actions]

Summary - Unit Tests Code Coverage

Summary

Generated on:	2/24/2026 - 9:46:21 AM
Coverage date:	2/24/2026 - 9:46:10 AM
Parser:	Cobertura
Assemblies:	1
Classes:	257
Files:	367
Line coverage:	61% (6267 of 10267)
Covered lines:	6267
Uncovered lines:	4000
Coverable lines:	10267
Total lines:	34572
Branch coverage:	53.1% (3177 of 5975)
Covered branches:	3177
Total branches:	5975
Method coverage:	Feature is only available for sponsors
Tag:	5456_22345224226

Coverage

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[Copilot]

Pull request overview

This pull request attempts to fix an issue where the OnTabChange callback was not being invoked when switching to a tab through the overflow menu. The change adds a call to HandleOnTabChangedAsync at the end of OnTabChangeHandlerAsync, which is called when tabs are changed programmatically, through the overflow menu, or when tabs are unregistered.

Changes:

• Added call to HandleOnTabChangedAsync in OnTabChangeHandlerAsync method to ensure OnTabChange callback fires for all tab change scenarios

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