[Marc-André Moreau (mamoreau-devolutions)]

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The Catalog Editor is an administrator tool, but it sat in the main sidebar, where any curious user could open it and edit the deployed catalog. This PR hides it unless an administrator turns it on, and only lets you reach it from the Software Catalog page.

What changes

• New setting, off by default. "Enable the Catalog Editor" is a new option under Experimental settings → Enable Software Catalog. It is greyed out until the catalog is enabled and, like the catalog setting, needs a restart.
• Out of the sidebar. The Catalog Editor nav item is removed. If a saved sidebar order includes it, the entry is dropped.
• Two ways in, both only when the setting is on:
  • a Catalog Editor button in the Software Catalog toolbar, next to Filters and Reload, which opens the editor as it was left;
  • a Create a catalog button in the empty state ("No software catalog has been set up on this device yet."), which opens the editor on a new catalog file.
• Way back. Any packages page can now show a small "‹ Parent page" link above its title, set through PackagesPageViewModel.ParentPageTitle. Only the Catalog Editor uses it, to link back to Software Catalog.
• Blank start. The editor opens on an untitled, empty document instead of loading the machine-wide SoftwareCatalog.json, so the deployed catalog is only changed when someone opens it on purpose. Open file, and Save for an untitled document, start in the deployed catalog's folder when that folder exists.
• Other ways in follow the setting too:
  • "Add selection to catalog" on Discover Packages;
  • the "catalog-editor" startup page;
  • the background API's "catalog-editor" page;
  • direct navigation, which shows a "Catalog Editor is disabled" banner when the setting is off.

Notes for reviewers

• The editor page's header icon changed from package_managers to catalog_add, to match the toolbar button.
• PackagesPageViewModel.NoPackagesText is now settable. The editor uses it to say "Create a new catalog or open a catalog file" when no catalog is open.
• SoftwareCatalogViewModel.EditCommand was never bound to anything. It and its test are removed.
• New English strings are in lang_en.json. Other languages aren't updated.

Testing

• All 902 tests in UniGetUI.Tests and 298 in UniGetUI.Core.Language.Tests pass. One full run reported a single failure that did not reproduce on two later runs, and that run did not name the failing test.
• Updated the sidebar-order tests, and added a test that the editor starts on an untitled document instead of the deployed catalog.
• Built and ran the app on Windows. The toolbar button, the setting and the editor were checked by hand; the empty-state button and the back link have not been clicked through yet.

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