Add link to referenced docs in document view

[vkarpov15]

Summary

• enable navigation to referenced documents from the document details page using <router-link>

Testing

• npm run lint
• npm test (fails: Timeout of 2000ms exceeded)

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https://chatgpt.com/codex/tasks/task_e_687564777220832488393744cc41af2d

[Copilot]

Pull Request Overview

Adds a direct link to navigate to referenced documents from the document details view, using <router-link>.

• Wraps the path display in a flex container with space-between alignment.
• Introduces a conditional <router-link> that points to /model/{ref}/document/{id} when path.ref and the value for the path exist.
• Adjusts layout to accommodate the new link without affecting existing date-edit UI.

Comments suppressed due to low confidence (1)

frontend/src/document-details/document-property/document-property.html:11

• There are no tests covering this new link behavior. Add unit tests to verify that the router-link renders when path.ref and the value exist, and that it navigates to the correct path.

        <router-link