fix(enable_banking): match bank list search against BIC, not just name (#1874)

* fix(enable_banking): match bank list search against BIC, not just name

Bank-search filter on the Enable Banking bank-selection modal only indexed
`aspsp[:name]`, so users searching by BIC code (e.g. `INGDDEFF`) got no
results even when the bank was rendered in the list. Switch the per-item
data attribute to a `name + BIC` haystack and read from it in the Stimulus
controller, so either token matches.

Refs #1814

* style(bank_search): apply Biome formatting to forEach callback (#1874 review)

test/controllers/enable_banking_items_controller_test.rb

@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require "test_helper"
+require "openssl"
+
+class EnableBankingItemsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in users(:family_admin)
+    @family = families(:dylan_family)
+    @item = @family.enable_banking_items.create!(
+      name: "Test Connection",
+      country_code: "DE",
+      application_id: "test_app_id",
+      client_certificate: OpenSSL::PKey::RSA.new(2048).to_pem
+    )
+  end
+
+  test "select_bank exposes ASPSP BIC in the searchable data attribute" do
+    Provider::EnableBanking.any_instance.stubs(:get_aspsps).returns(
+      aspsps: [
+        {
+          name: "ING-DiBa AG",
+          country: "DE",
+          bic: "INGDDEFF",
+          beta: false,
+          psu_types: [ "personal" ],
+          auth_methods: [ { approach: "REDIRECT" } ]
+        }
+      ]
+    )
+
+    get select_bank_enable_banking_item_url(@item)
+
+    assert_response :success
+    haystack = @response.body[/data-bank-search="([^"]*)"/, 1]
+    assert haystack, "Expected list items to render a data-bank-search attribute the client filter reads from"
+    assert_includes haystack, "ingddeff",
+      "Expected the searchable data attribute to include the BIC so users can find banks by BIC code"
+    assert_includes haystack, "ing-diba ag",
+      "Expected the searchable data attribute to still include the bank name (existing name-search behavior)"
+  end
+end