fix(enable-banking): refactor error handling and add missing GIN index (#1432)

* fix(enable-banking): refactor error handling and add missing GIN index

* fix(enable-banking): handle wrapped network errors and fix concurrent index migration

* fix(enable-banking): extract network errors to frozen constant

* fix(enable-banking): consolidate error handling and enforce strict localization

* fix(enable-banking): improve sync error handling and fix invalid test status

* test(enable_banking): use OpenStruct instead of mock for provider

db/migrate/20260411082125_add_gin_index_to_enable_banking_accounts_identification_hashes.rb

@@ -0,0 +1,7 @@
+class AddGinIndexToEnableBankingAccountsIdentificationHashes < ActiveRecord::Migration[7.2]
+  disable_ddl_transaction!
+
+  def change
+    add_index :enable_banking_accounts, :identification_hashes, using: :gin, algorithm: :concurrently
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2026_04_10_114435) do
+ActiveRecord::Schema[7.2].define(version: 2026_04_11_082125) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -408,6 +408,7 @@ ActiveRecord::Schema[7.2].define(version: 2026_04_10_114435) do
     t.jsonb "identification_hashes", default: []
     t.index ["account_id"], name: "index_enable_banking_accounts_on_account_id"
     t.index ["enable_banking_item_id"], name: "index_enable_banking_accounts_on_enable_banking_item_id"
+    t.index ["identification_hashes"], name: "index_enable_banking_accounts_on_identification_hashes", using: :gin
   end
 
   create_table "enable_banking_items", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|