Refactor MemberEditView to include permissions, success messages, and HTMX support. Adjust member filter template layout to use flex-row.

backend/members/views.py

@@ -56,7 +56,22 @@ class MemberAddView(HTMXViewMixin, PermissionRequiredMixin, SuccessMessageMixin,
         return self.success_message % dict(cleaned_data, name=self.object.user.get_full_name())
 
 
-class MemberEditView: ...
+class MemberEditView(HTMXViewMixin, PermissionRequiredMixin, SuccessMessageMixin, UpdateView):
+    model = Member
+    form_class = MemberForm
+    permission_required = "members.change_member"
+    permission_denied_message = _("You do not have permission to view this page.")
+    success_message = _("Member <strong>%(name)s</strong> has been updated successfully.")
+    success_url = reverse_lazy("backend:members:list")
+    partial_name = "members/member_form.html#content"
+    menu_highlight = "members"
+    
+    def handle_no_permission(self) -> HttpResponseRedirect:
+        messages.error(self.request, self.get_permission_denied_message())
+        return HttpResponseRedirect(reverse_lazy("backend:index"))
+    
+    def get_success_message(self, cleaned_data):
+        return self.success_message % dict(cleaned_data, name=self.object.user.get_full_name())
 
 
 class MemberDeleteView(HTMXViewMixin, PermissionRequiredMixin, SuccessMessageMixin, DeleteView):