refactor(bank-statement-importer): drop redundant Default Company field

System is single-company; Default Company on Bank Statement Importer
duplicated what ERPNext already exposes via Global Defaults. Removed
the field and replaced bi.default_company with erpnext.get_default_company()
at the two usage sites (Bank Account creation, Bank Transaction bulk
import). Existing column on tabBank Statement Importer is left in place
— Frappe just ignores it.

jey_erp/bank_integration/creation.py

@@ -207,6 +207,8 @@ def create_unmapped_suppliers(bank_integration):
 @frappe.whitelist()
 def create_unmapped_accounts(bank_integration):
 	"""Create Bank Account records for unmapped account_mappings rows."""
+	import erpnext
+
 	bi = frappe.get_doc("Bank Statement Importer", bank_integration)
 
 	unmapped = [r for r in bi.account_mappings if not r.bank_account and r.iban]
@@ -214,14 +216,14 @@ def create_unmapped_accounts(bank_integration):
 		return {"success": True, "created_count": 0, "message": "No unmapped accounts to create"}
 
 	default_bank = bi.default_bank
-	default_company = bi.default_company
+	default_company = erpnext.get_default_company()
 
 	# Only need these for accounts that don't already exist as Bank Accounts.
 	if any(not frappe.db.exists("Bank Account", {"bank_account_no": r.iban}) for r in unmapped):
 		if not default_company:
-			frappe.throw(_("Set a Default Company on the Bank Integration before creating Bank Accounts."))
+			frappe.throw(_("Set a Default Company in Global Defaults before creating Bank Accounts."))
 		if not default_bank:
-			frappe.throw(_("Set a Default Bank on the Bank Integration before creating Bank Accounts."))
+			frappe.throw(_("Set a Default Bank on the Bank Statement Importer before creating Bank Accounts."))
 
 	created = 0
 	for row in unmapped:

jey_erp/bank_integration/import_api.py

@@ -101,10 +101,12 @@ def import_bulk_bt(txn_list, bank_integration, bank_account):
 
 def _process_bulk_bt_import(txn_list, bank_integration, bank_account, user):
 	"""Background job: create one Bank Transaction per row."""
+	import erpnext
+
 	frappe.set_user(user)
 
 	bi = frappe.get_doc("Bank Statement Importer", bank_integration)
-	company = bi.default_company
+	company = erpnext.get_default_company()
 
 	ba_doc = frappe.get_doc("Bank Account", bank_account)
 	ba_account = ba_doc.account

jey_erp/jey_erp/doctype/bank_statement_importer/bank_statement_importer.json

@@ -7,7 +7,6 @@
  "field_order": [
   "settings_tab",
   "bank_name",
-  "default_company",
   "default_bank",
   "general_section",
   "similarity_threshold_customers",
@@ -75,12 +74,6 @@
    "reqd": 1,
    "unique": 1
   },
-  {
-   "fieldname": "default_company",
-   "fieldtype": "Link",
-   "label": "Default Company",
-   "options": "Company"
-  },
   {
    "fieldname": "default_bank",
    "fieldtype": "Link",