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/customers/CustomerForm.tsx

@@ -50,7 +50,7 @@ export default function CustomerForm({
     vat_number: z.string().optional(),
     personal_number: z
       .string()
-      .regex(/^(\d{6}|\d{8})[-+]?\d{4}$/, t('personal_number_invalid'))
+      .regex(/^(?:(\d{6}|\d{8})[-+]?\d{4}|\*{8}-\d{4})$/, t('personal_number_invalid'))
       .optional()
       .or(z.literal('')),
     language: z.enum(['sv', 'en']).optional(),
@@ -133,11 +133,15 @@ export default function CustomerForm({
   }
 
   const onFormSubmit = (data: FormData) => {
-    onSubmit({
+    const payload: CreateCustomerInput = {
       ...data,
       email: data.email || undefined,
-      personal_number: data.personal_number || undefined,
-    })
+      personal_number: data.personal_number || null,
+    }
+    if (data.personal_number?.startsWith('*') && data.personal_number === initialData?.personal_number) {
+      delete payload.personal_number
+    }
+    onSubmit(payload)
   }
 
   return (