feat(skatteverket): production-ready momsdeklaration submission (#380)

* feat(skatteverket): production-ready momsdeklaration submission

Brings the Skatteverket extension up to a state where it can ship moms
declaration submission to Vercel production. Verified end-to-end against
SKV's Komplett testtjänst — all 8 momsdeklaration operations tested
(kontrollera, spara/hämta/radera utkast, lås/lås upp, hämta inlämnade,
hämta beslutade) plus signing-link return.

Bundles three coherent changes:

1. Skatteverket extension (the main work)
   - extensions.config.json: enable `skatteverket`, drop `invoice-inbox`
     and `ai-agent` (those were enabled in config but lacked AWS env vars
     in prod, so they loaded but failed at runtime)
   - lib/reports/vat-declaration.ts: extend ACCOUNT_RUTA to populate
     Ruta 06 (uttag 3401–3403), Ruta 20–24 (reverse-charge bases from
     4xxx cost accounts), Ruta 50 (import 4545–4547), and Ruta 42
     (3404/3994/3980); delete the supplier-type heuristic that made
     Ruta 20 and Ruta 23 always 0
   - extensions/general/skatteverket/lib/token-store.ts: work around
     three real prod schema-drift issues — wrong column on read/delete
     (was `company_id`, schema only has `user_id`), missing
     UNIQUE(user_id) constraint that makes UPSERT fail (switched to
     DELETE+INSERT), missing RLS policies (switched to service-role
     client). Refresh path now reuses existing row's company_id when
     none is passed.
   - extensions/general/skatteverket/index.ts: 9 sites switched from
     ctx.companyId to ctx.userId for the token-store key; pass
     companyId from the OAuth callback
   - extensions/general/skatteverket/types.ts + components/reports/
     SkatteverketPanel.tsx: align field names with v1.0.24 RAML
     (signeringsLank/kontrollResultat/resultat/kod/status/beskrivning).
     Without this, the signing link never displayed.
   - SkatteverketPanel: add Lås upp + Radera utkast + Hämta utkast +
     Hämta beslut buttons so the full lifecycle is reachable from the UI
   - lib/reports/__tests__/vat-declaration.test.ts: rewritten to match
     the refactored calculator; new fixtures for cost-account-based
     reverse charge (Ruta 20/21/22/23/24), Ruta 50 import, Ruta 06
     uttag, Ruta 42 expansion; SKV §4.1.1.4 cross-field contract checks
   - supabase/migrations/20260428120000_skatteverket_tokens_user_id_unique.sql:
     idempotently adds the missing UNIQUE(user_id) constraint
   - scripts/*: dev-only helpers used during the prod-of-test
     verification (create test company, seed VAT data, inspect token
     state, etc.)

2. Journal-entries cancelled-status filter
   - app/api/bookkeeping/journal-entries/route.ts: when no status filter
     is supplied, exclude `cancelled` entries by default
   - supabase/migrations/20260428153500_journal_entries_with_related_exclude_statuses.sql

3. Swedish e-invoicing skill (reference docs only — no runtime code)
   - .claude/skills/swedish-e-invoicing/

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

* fix(skatteverket): address PR review findings

- panel: handleFetchDraft read `result.data?.last` (typo) — switched to
  `result.data?.locked` to match the field defined in
  SkatteverketUtkastResponse and the v1.0.24 RAML. The "(låst)" suffix on
  the success message would silently never appear before this fix.

- api-client: getValidToken had no concurrency guard, so two parallel
  SKV requests from the same user could both call /token with the same
  refresh_token. SKV rotates the refresh_token on first use, so the
  second call would 401 with REFRESH_EXHAUSTED-adjacent failures. With
  the new 6-button UI on SkatteverketPanel, rapid clicks made this a
  realistic trigger. Added an in-process Promise map keyed on userId
  that coalesces concurrent refresh attempts; cross-process races are
  mitigated by re-reading tokens inside the critical section before
  calling refreshAccessToken (if another process refreshed already, we
  use the newer token instead of burning the old refresh_token).

- migration 20260428120000: dedup query used `created_at < max(...)`,
  which failed to remove duplicates inserted in the same second. The
  subsequent ALTER TABLE … ADD CONSTRAINT would then abort. Switched
  to ctid (Postgres physical row identifier) to break timestamp ties.

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

* fix(skatteverket): throw on token-store SELECT error before destructive DELETE

The company_id pre-read in storeTokens used destructuring that discarded
the error field. If the service-role SELECT failed for any reason (network
blip, overloaded DB, transient permissions issue), `existing` became null,
`resolvedCompanyId` stayed undefined, and execution fell through to the
DELETE. The old row got deleted successfully, then the INSERT omitted
company_id and failed with the NOT NULL constraint violation — leaving
the user with no token row at all and forcing a fresh BankID handshake.

Now we capture the SELECT error and throw before the DELETE runs.

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

---------

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

app/api/bookkeeping/journal-entries/__tests__/route.test.ts

@@ -123,6 +123,23 @@ describe('GET /api/bookkeeping/journal-entries', () => {
     expect(body.count).toBe(2)
   })
 
+  it('forwards explicit ?status=cancelled to the RPC', async () => {
+    enqueue({ data: [], error: null })
+
+    const request = createMockRequest('/api/bookkeeping/journal-entries', {
+      searchParams: { period_id: 'period-1', status: 'cancelled' },
+    })
+    await GET(request)
+
+    // The RPC itself hides cancelled entries unless p_status='cancelled' is
+    // passed explicitly (see migration 20260428153500). The behavior of the
+    // hide-by-default logic lives in SQL and is covered by pg-real tests.
+    expect(mockSupabase.rpc).toHaveBeenCalledWith(
+      'list_fiscal_period_entries_with_related',
+      expect.objectContaining({ p_status: 'cancelled' })
+    )
+  })
+
   it('returns 500 on database error', async () => {
     enqueue({ data: null, error: { message: 'DB error' } })
 

app/api/bookkeeping/journal-entries/route.ts

@@ -84,6 +84,8 @@ export async function GET(request: Request) {
 
   if (status) {
     query = query.eq('status', status)
+  } else {
+    query = query.neq('status', 'cancelled')
   }
 
   if (dateFrom) {