[AlexAndBear]

Description

The "Resource not found" message in the files list had its own hand-built layout. It now uses the shared NoContentMessage component, like the other empty states and the 404 page.

• It shows the 404.svg empty-state image in place of the cloud icon.
• The title goes in the message slot. The explanation and the navigation buttons (Spaces overview, Personal page, Reload public link) go in the callToAction slot.
• The wrapper id and button ids are unchanged, so the existing selectors keep working.

Related Issue

• Fixes <issue_link>

How Has This Been Tested?

• test environment: local, Vitest
• test case 1: NotFoundMessage.spec.ts passes (button visibility and routes for the personal and public link routes)
• test case 2: ESLint and Prettier pass on the changed files

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)