fix(profile): redirect after successful POST so UI toggle takes effect

view_profile rendered the response inline after saving the form, which
meant UIPreferenceLoader and the beta-banner context processor ran
against the same request that just toggled ui_use_tailwind. The result
showed the previous UI on the success page; only the next request
reflected the change. Switch to Post-Redirect-Get so the success page
renders against a fresh request.

Also prevents form resubmission on refresh.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: devGregA

dojo/user/views.py

@@ -255,6 +255,12 @@ def view_profile(request):
                                  messages.SUCCESS,
                                  _("Profile updated successfully."),
                                  extra_tags="alert-success")
+            # Redirect so the response renders against a fresh request — this
+            # ensures UIPreferenceLoader and the UI-toggle banner read the
+            # just-saved usercontactinfo (e.g. ui_use_tailwind) instead of any
+            # state cached on the POST request. Also prevents form
+            # resubmission on refresh.
+            return HttpResponseRedirect(reverse("view_profile"))
     add_breadcrumb(title=_("User Profile - %(user_full_name)s") % {"user_full_name": user.get_full_name()}, top_level=True, request=request)
     return render(request, "dojo/profile.html", {
         "user": user,