Bug/baskontoplan numbers (#463)

* feat(settings): add option for company name position in invoice PDF

* feat(migrations): add backfill for VAT account labels to correct bad seed data

* feat(migrations): add backfill for VAT account labels to correct bad seed data

* fix(ui): improve accessibility for company name position toggle in PDF settings

* fix(bookkeeping): align BAS 2026 reference data with official PDF

Reconciled lib/bookkeeping/bas-data/ against the BAS 2026 v1.1 official
chart (1286 accounts). All real discrepancies fixed:

- 2089 Fond för utvecklingsutgifter: k2_excluded → true
- 8417 Räntekostnader för dold räntekompensation: k2_excluded → true
- 1250, 1260 renamed to "(Fritt konto för Inventarier, verktyg och
  installationer)" — BAS 2026 freed these slots
- Periodiseringsfond 2120-2139: added year suffixes (2120 = "...2020"
  etc.) and added 8 missing accounts (2121-2127, 2129) for years
  2019, 2021-2027. Dropped phantom 2022/2024 prior-parser garbage.
- 4075-4078: EUland → EU-land
- 8411: förlagsoch → förlags- och

Verified: 1282 of 1286 PDF accounts match exactly after edits (remaining
4 are PDF-parser artifacts, not real data). Build clean.

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

* feat(migrations): backfill BAS 2026 account labels in chart_of_accounts

Companion to the TS reference fix. Updates existing companies' rows where
they still carry seed-data typos or generic names that don't match BAS 2026:

- 4075-4078: EUland → EU-land (hyphenation)
- 8411: förlagsoch → förlags- och (hyphenation)
- 2120, 2130-2137, 2139: rename "Periodiseringsfond" (generic, no year) to
  the BAS 2026 canonical name with year suffix

Defensive: every WHERE clause matches an EXACT current value. Rows that
have been manually renamed by users — including those with a wrong year
that may reference legacy fonds from an earlier BAS numbering cycle — are
left untouched. No row is deleted.

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

* feat(migrations): fix wrong-year labels on Periodiseringsfond accounts

Follow-up to 20260513140000. The first backfill only renamed accounts whose
name was the generic "Periodiseringsfond" (no year). Many customers were
seeded from an older BAS numbering cycle where 2126 = "2016", 2127 = "2017",
etc. — BAS 2026 reuses those account numbers for years 2026/2027.

This migration aligns the year tag with the BAS 2026 meaning of each
account number across 2120-2127, 2129, 2130-2137, 2139. Only rows whose
name still starts with "Periodiseringsfond" are touched — customers who
renamed the account to something custom keep their name.

Verified on staging: all 18 accounts now carry BAS 2026 canonical names.

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

* fix(data): update account names and descriptions for clarity and consistency

* fix(migrations): backfill account names for BAS 2026 freed accounts and refine Periodiseringsfond name matching

---------

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

lib/bookkeeping/__tests__/bas-reference.test.ts

@@ -166,10 +166,11 @@ describe('K2-excluded accounts', () => {
   const k2Excluded = [
     '1010', '1011', '1012', '1018', '1019',
     '1370', '1518',
-    '2092', '2096', '2240', '2448',
+    '2089', '2092', '2096', '2240', '2448',
     '3940', '7940',
     '8290', '8291', '8295',
     '8320', '8321', '8325',
+    '8417',
     '8450', '8451', '8455',
     '8480', '8940',
   ]
@@ -191,9 +192,9 @@ describe('K2-excluded accounts', () => {
     }
   })
 
-  it('total K2-excluded count matches expected (24)', () => {
+  it('total K2-excluded count matches expected (26)', () => {
     const k2Count = BAS_REFERENCE.filter((a) => a.k2_excluded).length
-    expect(k2Count).toBe(24)
+    expect(k2Count).toBe(26)
   })
 })