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fix(web): avoid misleading UI when no desktops are available (#3436)

While presenting the work done at
https://github.com/agama-project/agama/pull/3420, @joseivanlopez
identified a corner case not handled by it: when products do not offer
any desktop environments.

The previous implementation could show misleading messages such as “No
desktop selected,” offer links to select a desktop that didn't exist, or
display an empty desktop selection page. While this didn't make Agama
crash, it created a confusing and unexpected experience.

This PR ensures the UI adapts gracefully with a few behavioral changes:

* **Avoid misleading messages** by only showing “No desktop selected”
when desktops are actually available, **regardless of whether the
product is configured to suggest a desktop selection**.
* **Prevent empty views and maintain UI consistency** by redirecting
users away from the desktop selection page when no desktops exist and
displaying a clear informational message in the software page section.
The desktop section is intentionally **not hidden** in this case to
preserve layout consistency.

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