Improve Toast vs Modal behavior

[brian-smith-tcril]

See:

• https://github.com/openedx/frontend-app-admin-console/pull/3/files#r2446081231
• Can't close toast about changing tags frontend-app-authoring#1898
• fix: pointer-events issue on toast container frontend-app-authoring#2139
• Can't close toast about changing tags paragon#3654

[dcoa]

For managing this I implement the workaround explained in authoring

frontend-app-admin-console/src/authz-module/index.scss

Lines 70 to 74 in a0dc22c

	// Fix a bug with a toast on edit tags sheet component: can't click on close toast button
	// https://github.com/openedx/frontend-app-authoring/issues/1898
	#toast-root[data-focus-on-hidden] {
	pointer-events: initial !important;
	}

Plus blocking the modals to avoid closing it when the toast action is launch

frontend-app-admin-console/src/authz-module/libraries-manager/components/AssignNewRoleModal/AssignNewRoleModal.tsx

Line 31 in a0dc22c

isBlocking

Screencast.from.2025-11-03.08-29-25.webm