feat(Mask): add OnCloseAsync cascade parameter

[j4587698]

Link issues

fixes #6608

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 asynchronous close callback support to the Mask component and update the samples to demonstrate its usage.

New Features:

• Expose CloseAsync as a cascading callback in Mask to allow child content to trigger mask closure asynchronously
• Introduce a MaskDemo component that receives the OnCloseAsync callback and renders a Close button

Enhancements:

• Add ShowCloseMask method and corresponding DemoBlock to server samples to showcase programmatic opening and closing with the new callback

[bb-auto]

Thanks for your PR, @j4587698. Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[sourcery-ai]

Reviewer's Guide

Introduces an OnCloseAsync callback into the Mask component, allowing child content to programmatically close the mask via a cascading parameter, and updates sample pages to demonstrate this behavior.

File-Level Changes

Change	Details	Files
Added OnCloseAsync callback mechanism to Mask component	Introduced CloseAsync method to hide mask by calling Show(null) Wrapped ChildContent in a CascadingValue supplying CloseAsync Created MaskDemo component consuming OnCloseAsync via cascading parameter and invoking it on button click	src/BootstrapBlazor/Components/Mask/Mask.razor.cs src/BootstrapBlazor/Components/Mask/Mask.razor src/BootstrapBlazor.Server/Components/Components/MaskDemo.razor
Updated sample to demonstrate Mask close callback	Added ShowCloseMask method to Samples/Masks.razor.cs to display MaskDemo component Introduced a DemoBlock and Show button in Samples/Masks.razor to trigger the new mask example	src/BootstrapBlazor.Server/Components/Samples/Masks.razor.cs src/BootstrapBlazor.Server/Components/Samples/Masks.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6608	Enable MaskService to be closed from within its own content (i.e., allow internal closing).	✅

Possibly linked issues

• feat(Mask): support DialogCloseButton #6608: The PR adds an OnCloseAsync callback and a mechanism for internal components to trigger it, enabling internal closure of the MaskService, directly addressing the issue.
• feat(Mask): support DialogCloseButton #6608: The PR adds an OnCloseAsync callback for the Mask component, which likely enables DialogService to correctly trigger its OnCloseAsync, addressing the issue.
• feat(Mask): support DialogCloseButton #6608: The PR adds OnCloseAsync callback to the Mask component, which directly addresses the issue of OnCloseAsync not being triggered for previous dialogs, as Dialogs likely use Mask internally.

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[sourcery-ai]

Hey @j4587698 - I've reviewed your changes - here's some feedback:

• Rename the cascading delegate name from CloseAsync to something more descriptive like OnMaskCloseAsync to avoid generic naming and improve clarity.
• Consider adding an OnCloseAsync callback property on MaskOption so consumers can hook into the close event directly instead of relying solely on a CascadingParameter.
• Expose the CloseAsync method (or a similarly named public API) on the Mask component or MaskService to allow programmatic closing without requiring a CascadingParameter.

Prompt for AI Agents

Please address the comments from this code review:
## Overall Comments
- Rename the cascading delegate name from `CloseAsync` to something more descriptive like `OnMaskCloseAsync` to avoid generic naming and improve clarity.
- Consider adding an `OnCloseAsync` callback property on `MaskOption` so consumers can hook into the close event directly instead of relying solely on a CascadingParameter.
- Expose the `CloseAsync` method (or a similarly named public API) on the Mask component or MaskService to allow programmatic closing without requiring a CascadingParameter.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (948a9b9) to head (6f5cc41).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6609   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          739       739           
  Lines        31669     31672    +3     
  Branches      4458      4458           
=========================================
+ Hits         31669     31672    +3     

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

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