Fix/supp ag fb (#1023)

* fix: prevent credit notes from entering payment flow

* fix: persist and display customer personal numbers

* feat: configure automatic invoice reminder days

* fix: issue credit notes through send flow

* chore: add repository agent guidance

* feat(mcp): route tools across user companies

* fix(articles): delete unused register entries

* feat(invoices): improve issued invoice actions

* feat(supplier-invoices): retain uploaded source documents

* docs: record implementation decisions

* feat: enhance customer personal number handling and validation

- Updated CustomerForm to allow personal numbers in the format of "********-1234" for individual customers.
- Added validation to ensure personal numbers are only accepted for individual customers in CreateCustomerSchema.
- Implemented masking and encryption for personal numbers to enhance data protection.
- Introduced new utility functions for masking and encrypting personal numbers.
- Added database migration to enforce unique constraints on credit note relationships and prevent duplicate entries.
- Enhanced error handling and logging for credit note issuance and invoice processing.
- Updated tests to cover new credit note creation guards and personal number handling.

* test: enhance list companies test with supabase query mocks

components/settings/sections/InvoicingSettingsContent.tsx

@@ -51,6 +51,12 @@ export function InvoicingSettingsContent() {
       invoice_default_days: parseInt(formData.get('invoice_default_days') as string) || 30,
       invoice_default_notes: (formData.get('invoice_default_notes') as string) || null,
       default_our_reference: (formData.get('default_our_reference') as string) || null,
+      reminder_days_level_1:
+        Number.parseInt(formData.get('reminder_days_level_1') as string) || 15,
+      reminder_days_level_2:
+        Number.parseInt(formData.get('reminder_days_level_2') as string) || 30,
+      reminder_days_level_3:
+        Number.parseInt(formData.get('reminder_days_level_3') as string) || 45,
     }
     return {
       updates,