fix: Unify version display for public and private designs

[zihanKuang]

Notes for Reviewers

This PR fixes: https://github.com/layer5io/meshery-cloud/issues/3585

Reason

There are three relevant states for a design: private, public, and published. The private and public states should both reflect the current draft's version number, which is stored in the version field. Only a published design should display the published_version.

The bug was that the UI was incorrectly displaying the published_version for designs that were set to public. This created problems:

1. Inconsistent Versions: If a public design had no published_version, the UI would show an incorrect fallback value (like 0.0.0 or "").
2. Wrong Versions: If a public design has a published_version, the UI would show an incorrect value.

Fix

20250617_200454.mp4