Show vault breadcrumb icons from breadcrumb item props

[AlexAndBear]

Description

• Render breadcrumb item icons from OcBreadcrumb items prop for links, buttons, static labels, and the truncation menu.
• Keep vault icon rendering in files breadcrumbs scoped to vault resources via vault claim root matching.
• Preserve icon when the last breadcrumb is converted to a click action via concatBreadcrumbs.

Related Issue

• Fixes Show that a vault is a special folder / has limited capabilities #3325

How Has This Been Tested?

• test environment: local macOS workspace with pnpm + Vitest
• test case 1: pnpm test:unit --run packages/design-system/src/components/OcBreadcrumb/OcBreadcrumb.spec.ts
• test case 2: pnpm test:unit --run packages/web-app-files/tests/unit/views/spaces/GenericSpace.spec.ts
• test case 3: pnpm test:unit --run packages/web-pkg/tests/unit/composables/breadcrumbs/useBreadcrumbsFromPath.spec.ts packages/web-pkg/tests/unit/helpers/breadcrumbs.spec.ts
• test case 4: pnpm eslint packages/design-system/src/components/OcBreadcrumb/OcBreadcrumb.vue packages/design-system/src/components/OcBreadcrumb/OcBreadcrumb.spec.ts packages/web-app-files/src/views/spaces/GenericSpace.vue packages/web-app-files/tests/unit/views/spaces/GenericSpace.spec.ts packages/web-pkg/src/composables/breadcrumbs/useBreadcrumbsFromPath.ts packages/web-pkg/src/helpers/breadcrumbs.ts packages/web-pkg/tests/unit/composables/breadcrumbs/useBreadcrumbsFromPath.spec.ts packages/web-pkg/tests/unit/helpers/breadcrumbs.spec.ts

Types of changes

• Bugfix
• Enhancement (a change that doesn't break existing code or deployments)
• Breaking change (a modification that affects current functionality)
• Technical debt (addressing code that needs refactoring or improvements)
• Tests (adding or improving tests)
• Documentation (updates or additions to documentation)
• Maintenance (like dependency updates or tooling adjustments)