Member show & MembershipFees: permissions, delete all, regenerate, errors

- Show: handle_info :member_updated and :put_flash; Linked User only when can_access_page? /users
- MembershipFeesComponent: can_create_cycle/can_destroy_cycle/can_update_cycle; buttons gated
- Delete all cycles via Ash.destroy (policy enforced); format_error Forbidden
- Regenerate cycles for normal_user and admin (no admin-only check)
- Member form: format_error tuple for membership_fee_type_id; Select a membership fee type (no None)
- show_membership_fees_test: read_only UI and policy tests

lib/mv_web/live/member_live/form.ex

@@ -177,7 +177,8 @@ defmodule MvWeb.MemberLive.Form do
                   phx-change="validate"
                   value={@form[:membership_fee_type_id].value || ""}
                 >
-                  <option value="">{gettext("None")}</option>
+                  <%!-- No "None" option: a membership fee type is required (validated in Member resource). --%>
+                  <option value="">{gettext("Select a membership fee type")}</option>
                   <%= for fee_type <- @available_fee_types do %>
                     <option
                       value={fee_type.id}
@@ -189,7 +190,8 @@ defmodule MvWeb.MemberLive.Form do
                     </option>
                   <% end %>
                 </select>
-                <%= for {msg, _opts} <- @form.errors[:membership_fee_type_id] || [] do %>
+                <%= for error <- List.wrap(@form.errors[:membership_fee_type_id] || []) do %>
+                  <% {msg, _opts} = if is_tuple(error), do: error, else: {error, []} %>
                   <p class="text-error text-sm mt-1">{msg}</p>
                 <% end %>
                 <%= if @interval_warning do %>