Sort donations item category filter alphabetically

QA found the item category filter options were not in alphabetical
order. The item_categories collection was the only filter built without
ordering, while the adjacent items and product_drives collections use
the alphabetized scope. Add the standard alphabetized scope to
ItemCategory (matching the pattern in 11 other models) and apply it here.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: costajohnt

app/models/item_category.rb

@@ -18,6 +18,8 @@ class ItemCategory < ApplicationRecord
   has_many :items, -> { order(name: :asc) }, inverse_of: :item_category, dependent: :nullify
   has_and_belongs_to_many :partner_groups, dependent: :nullify
 
+  scope :alphabetized, -> { order(:name) }
+
   before_destroy :ensure_no_associated_partner_groups
 
   private

app/models/view/donations.rb

@@ -51,7 +51,7 @@ def from_params(params:, organization:, helpers:)
           donations: donations,
           filters: filters,
           items: organization.items.alphabetized.select(:id, :name),
-          item_categories: organization.item_categories.pluck(:name).uniq,
+          item_categories: organization.item_categories.alphabetized.pluck(:name).uniq,
           paginated_donations: paginated_donations,
           product_drives: organization.product_drives.alphabetized,
           product_drive_participants: organization.product_drive_participants.alphabetized,

spec/system/donation_system_spec.rb

@@ -161,6 +161,15 @@
         expect(page).to have_css("table tbody tr", count: 1)
       end
 
+      it "lists item categories alphabetically in the filter" do
+        names = ["Zebra supplies", "Apple goods", "Mango wares"]
+        names.each { |name| create(:item_category, name: name, organization: organization) }
+        visit subject
+        rendered = find("select[name='filters[by_category]']").all("option").map(&:text)
+        ours = rendered.select { |option| names.include?(option) }
+        expect(ours).to eq(names.sort)
+      end
+
       it_behaves_like "Date Range Picker", Donation, "issued_at"
 
       it "Filters by multiple attributes" do