Follow-up review fixes for MudBlazor PR #25393

[maliming]

Continues to address Copilot review comments left on #25393 and on the dev merge PR #25479.

[Copilot]

Pull request overview

This PR follows up on prior MudBlazor-related review feedback by improving initial loading UX in the Setting Management page, adding accessibility labels to search fields, and adjusting the MudBlazor page progress service’s show/hide behavior.

Changes:

• Add an explicit _loading state to SettingManagement to show a spinner during async initialization and avoid “stuck” loading based on SelectedGroup.
• Add aria-label attributes to MudBlazor search inputs to improve screen-reader accessibility.
• Refactor MudBlazorUiPageProgressService to track visibility and default options (but currently introduces non-thread-safe state updates).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
modules/setting-management/src/Volo.Abp.SettingManagement.Blazor.MudBlazor/Pages/SettingManagement/SettingManagement.razor.cs	Introduces _loading state toggled during async initialization.
modules/setting-management/src/Volo.Abp.SettingManagement.Blazor.MudBlazor/Pages/SettingManagement/SettingManagement.razor	Uses _loading to render a spinner and conditions tab rendering on available groups.
modules/permission-management/src/Volo.Abp.PermissionManagement.Blazor.MudBlazor/Components/PermissionManagementModal.razor	Adds aria-label to the permission group search field.
modules/identity/src/Volo.Abp.Identity.Blazor.MudBlazor/Pages/Identity/UserManagement.razor	Adds aria-label to the user list search field.
framework/src/Volo.Abp.MudBlazorUI/MudBlazorUiPageProgressService.cs	Refactors progress notification logic; current implementation has concurrency issues around shared mutable state.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.42%. Comparing base (868c729) to head (c13a909).

Additional details and impacted files

@@            Coverage Diff            @@
##           rel-10.4   #25483   +/-   ##
=========================================
  Coverage     49.42%   49.42%           
=========================================
  Files          3670     3670           
  Lines        123599   123599           
  Branches       9453     9453           
=========================================
+ Hits          61083    61090    +7     
+ Misses        60682    60671   -11     
- Partials       1834     1838    +4     

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