[KeyCode] Add Only, Ignore and PreventDefaultOnly to FluentKeyCodeProvider

[NoobMaster (oONoobMasterOo)]

Fixes #4519

FluentKeyCodeProvider only exposed PreventDefault, which prevents the default action of every key, including the Esc key used to close dialogs. It now also exposes the filters already supported by FluentKeyCode, and passes them to its global FluentKeyCode:

• PreventDefaultOnly: prevent the default action for some keys only.
• Only: listen to these keys only.
• Ignore: ignore these keys.

<FluentKeyCodeProvider PreventDefaultOnly="@(new[] { KeyCode.KeyS })" />

The issue also suggests passing these options to KeyCodeService.RegisterListener. That's not possible for PreventDefault: the default action must be prevented synchronously in the browser, before the listeners registered on the server are called. So the options are set on the provider, like PreventDefault today.

Unit Tests

Added FluentKeyCode_Provider_PassesKeyFilters.

[Copilot]

🟢 Approval recommended

The focused changes reuse existing filtering behavior, include regression coverage, and have no identified blocking issues.

No open issues 🎉

What changed in this PR

Exposes existing key filters through FluentKeyCodeProvider, enabling selective global keyboard handling for #4519.

Changes:

• Adds Only, Ignore, and PreventDefaultOnly parameters and forwards them to FluentKeyCode.
• Adds regression coverage for all three filters.

File	Description
tests/​Core/​Components/​KeyCode/​FluentKeyCodeTests.razor	Verifies filter values reach JavaScript registration.
src/​Core/​Components/​KeyCode/​FluentKeyCodeProvider.razor.cs	Declares the three provider parameters.
src/​Core/​Components/​KeyCode/​FluentKeyCodeProvider.razor	Forwards filters to the global component.

_{Review effort: Balanced}

[Denis Voituron (dvoituron)]

Could you please provide a short video showing the issue before the code change, and then the expected behavior after the fix? This will make it easier to clearly see and validate the improvement.
(You can use “Peek - Screen Recorder,” a free tool, to do this)

[NoobMaster (oONoobMasterOo)]

Before (dev): to block F5 with the global provider, the only option is <FluentKeyCodeProvider PreventDefault="true" />. F5 is blocked, but typing in the text input is blocked too, since the default action of every key is prevented.

5477-before.mp4

After (this PR): <FluentKeyCodeProvider PreventDefaultOnly="@(new[] { KeyCode.Function5 })" /> blocks F5 only, and typing in the text input works.

5477-after.mp4