When archiving a project, other views than the "Project Details" offer no indicator that a project has been archived apart from the blurred profile picture.
The Project Details page however shows a red "Archived" indicator (and the description may provide pointers what happened if someone updated it after archiving).
Showing the Project Details page allows users to more likely realize that a project has been archived (and the workboard or other menu item view of the archived project have likely become less relevant at this stage anyway).

Thus when archiving a project which has its default view not set to the "Project Details" page (use the "Manage > Edit Menu" to check), (re)set the default menu item to the Project Details page.

Closes T15882

• Archive a project with its existing Workboard set as default; go to its /tag/projectname URI: After applying the patch, it shows the project Profile
  • After applying the patch and archiving, SELECT menuItemKey, builtinKey, visibility FROM phabricator_search.search_profilepanelconfiguration cp JOIN phabricator_project.project p ON p.phid = cp.profilePHID WHERE (p.name = "MyLittleProject"); shows that project.workboard changed its visibility from default to visible and project.profile from visible to default
• Activate an archived project with its existing workboard set as default; go to its /tag/projectname URI: After applying the patch, still shows the project Workboard as expected, thus only applied when archiving.