feat: voucher linking, recovery ops, and salary overrides (#591)

* feat: voucher linking, recovery ops, and salary overrides

Adds reversible/correction-style write paths that customers and agents have
been asking for, plus per-run salary employee overrides.

Invoice → voucher linking
- POST /api/invoices/[id]/link-to-voucher and
  GET /api/invoices/[id]/voucher-candidates
- lib/invoices/voucher-matching.ts with full + pg test coverage
- LinkVoucherPicker UI in PaymentBookingDialog
- pending_operations.operation_type expanded with link_invoice_voucher
  (medium risk) and a (journal_entry_id, invoice_id) unique guard
- MCP: gnubok_find_voucher_candidates_for_invoice and
  gnubok_link_invoice_to_voucher tools

SIE undo
- POST /api/import/sie/[id]/undo + undo_sie_import RPC
- sie_imports.status gains 'undone'
- ImportResultStep surfaces the action; structured error SIE_UNDO_FAILED

Edit-recreate journal entries
- POST /api/bookkeeping/journal-entries/[id]/edit-recreate
- Bookkeeping detail page wires it into the existing edit flow

Delete-last-voucher clears IB link
- Trigger + pg test ensure deleting the last voucher of a period nulls the
  opening_balance_journal_entry_id link so a re-import lands cleanly

Salary employee overrides
- salary_run_employees gains per-run override fields + migration
- lib/salary/effective-values.ts centralises resolved values; all payslip,
  payment, AGI, KU, and booking routes read through it
- SalaryOverridePanel on the employee detail page

Account classifier
- lib/bookkeeping/account-classifier.ts + tests; AddAccountDialog uses it
- backfill-import-accounts script updated

Misc
- toast: minor styling tweak
- AGI generate-declaration: respect effective values
- structured-errors: new LINK_INVOICE_VOUCHER namespace

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* feat: add link_invoice_voucher operation type to pending_operations

* feat: refactor salary run calculations and update error handling for SIE imports

* fix: PR review feedback on voucher linking and SIE recovery

pg-real (blocking):
- tests/pg/delete-last-voucher-ib: drop posted_at = now() from the seed
  UPDATE — journal_entries has no posted_at column.
- lib/invoices/__tests__/voucher-matching.pg: seed the posted voucher
  before closing the fiscal period so enforce_period_lock doesn't block
  the INSERT during setup.

voucher-matching error codes and rollback:
- Add LINK_VOUCHER_DB_ERROR (HTTP 500) and return it on real invoice
  UPDATE / payment INSERT failures. Previously these returned
  LINK_VOUCHER_VOUCHER_NOT_FOUND (404) which the pending-op dispatcher
  auto-rejects on transient DB errors.
- Log rollback failures explicitly so an invoice left in a half-linked
  state (advanced status, no payment row) surfaces for manual
  reconciliation instead of disappearing silently.

resyncNextPeriodOpeningBalance ordering:
- Create the new IB first, relink the period FK, then storno the old IB.
  Previously the storno ran first; if createJournalEntry failed the next
  period was left with a reversed IB and nothing to replace it, and
  executeSIEImport swallows the error as a non-fatal warning.

replace_period_opening_balance_link:
- Tighten role check to owner/admin (was owner/admin/member). Matches
  delete_last_voucher and undo_sie_import.

Data minimisation:
- /api/invoices/[id]/voucher-candidates and the matching MCP tools now
  project only the invoice and customer fields the matcher reads, instead
  of returning the full customer row.

Schema bounds:
- SalaryEmployeeOverrideSchema caps each numeric override at 10 MSEK to
  catch typos before they reach the ledger or AGI.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(tests): supply user_id when seeding voucher_sequences

voucher_sequences.user_id is NOT NULL (per the multi-tenant refactor in
20260330130000). The previous test seed only set company_id /
fiscal_period_id / voucher_series, which made the seed fail with a
constraint violation on the latest pg-real run. Pass the same userId
used elsewhere in the seed helper.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(tests): scope delete-last-voucher RPC assertions inside the tx

withUserContext always ROLLBACKs, so any DELETE the RPC performs is
discarded when the callback returns. The previous test then queried
journal_entries via a fresh getPool() connection that only saw the
pre-RPC committed seed state — hence "expected '1' to be '0'".

Move every post-RPC assertion (entry count, period FK clear,
opening_balances_set flip, audit log entry, sie_imports clear) inside
the same withUserContext callback so they observe the uncommitted state
before ROLLBACK fires.

Also fix the sie_imports INSERT: the column is `filename`, not
`file_name`, and `sie_type` is NOT NULL.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(tests): assert against the IB-marker audit row directly

DELETE on journal_entries fires two audit_log writes: the generic
write_audit_log() trigger row ("Deleted journal_entries record") and the
delete_last_voucher RPC's explicit "(was period IB)" entry. Both land
at the same statement_timestamp(), so ORDER BY created_at DESC LIMIT 1
returned the trigger row non-deterministically in CI.

Switch to a presence check with a LIKE filter on the IB marker so the
test verifies what it actually cares about — that the RPC's IB-aware
audit row exists.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(db): set company_id on delete_last_voucher audit_log rows

20260528120000_delete_last_voucher_clears_ib_link.sql inserts directly
into audit_log without setting company_id. audit_log's SELECT policy
filters company_id IN user_company_ids(), so those rows landed with
company_id=NULL and were invisible to every reader — only the generic
write_audit_log() trigger row remained visible. That broke BFL audit-
trail intent: the "(was period IB)" provenance row was never readable.

Republish delete_last_voucher with p_company_id populated on both
audit_log INSERTs (draft path and posted path). Behavior is otherwise
unchanged; the pg-real test for the IB-clear flow now sees the
RPC-written marker row as expected.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Emil <emilmattsson14@gmail.com>

lib/import/__tests__/account-mapper.test.ts

@@ -2,6 +2,7 @@ import { describe, it, expect } from 'vitest'
 import type { BASAccount } from '@/types'
 import type { BASReferenceAccount } from '@/lib/bookkeeping/bas-reference'
 import type { SIEAccount, SIEAccountMappingRecord } from '../types'
+import { classifyAccount } from '@/lib/bookkeeping/account-classifier'
 import {
   suggestMappings,
   validateMappings,
@@ -15,14 +16,7 @@ import {
 
 function makeBASAccount(number: string, name: string): BASAccount {
   const classNum = parseInt(number.charAt(0), 10)
-  const accountType =
-    classNum <= 1
-      ? 'asset'
-      : classNum === 2
-        ? 'liability'
-        : classNum === 3
-          ? 'revenue'
-          : 'expense'
+  const classified = classifyAccount(number)
   return {
     id: `bas-${number}`,
     user_id: 'user-1',
@@ -31,8 +25,8 @@ function makeBASAccount(number: string, name: string): BASAccount {
     account_name: name,
     account_class: classNum,
     account_group: number.substring(0, 2),
-    account_type: accountType,
-    normal_balance: classNum <= 1 || classNum >= 4 ? 'debit' : 'credit',
+    account_type: classified.account_type,
+    normal_balance: classified.normal_balance,
     plan_type: 'k1',
     is_active: true,
     is_system_account: false,