tritium-legal makes document previews format-agnostic

This is a small plumbing change with a practical payoff: document viewers can now retrieve the active version of a file whether it is a Word document, PDF, or another supported format.

The approach also keeps existing links working, forwarding old Word-specific requests to the new general route. That matters because the platform sometimes needs to pass file contents through its own backend instead of sending the browser directly to cloud storage, where browser security restrictions can disrupt document previews, particularly for tracked changes.

For legal teams, it is a quiet step toward more consistent review across mixed document sets, without forcing existing integrations to change.