fix(scoping): Skatteverket per företag + nåbara startkort + företags-scopade val (#1610)

* fix(scoping): skatteverket per company + true pristine gates + scoped dismissals

Skatteverket connections become per (user, company): the token table
carried BOTH UNIQUE(user_id) and UNIQUE(company_id) (two stacked half
migrations), so one connection leaked "connected" onto every company the
user belongs to, sync ran the token against the wrong orgnr (behorighet
403), and reconnecting from another company silently moved the row and
went dark on the first company's crons. Token reads/writes are now scoped
by company through the whole chain (token-store, api-client refresh
coalescing, skvRequest and its 21 call sites, resolve-auth, crons, MCP),
/skattekonto/saldo answers 401 NOT_CONNECTED for companies without their
own row (which is what the page's startkort keys on), and the dashboard
connect-nudge counts only the active company's row.

Bookkeeping's pristine start card now keys on all-years emptiness via a
count probe instead of "no active filters": the default fiscal-year
selection counted as a filter, which made the card unreachable on
brand-new companies (it showed "inga traffar" instead).

Two browser-global localStorage keys become company-scoped with legacy
fallbacks: the inbox onboarding dismissal (dismissing on one company hid
the card everywhere) and the periodisering auto-detect toggle.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

* fix(scoping): dedupe cron work per (user, company) + guard the ledger probe

CodeRabbit findings on #1610: the skattekonto sync cron still deduped
token rows by user_id alone, which would drop every company but one for
multi-company operators (the exact scenario the PR fixes); and the
all-years ledger probe could leave a stale false behind on a failed
refetch, letting the pristine card render unconfirmed. The probe now
resets to unknown in flight and carries the fetch generation guard.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

---------

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

components/settings/PeriodiseringAutoDetectToggle.tsx

@@ -1,18 +1,22 @@
 'use client'
 
-import { useCallback, useSyncExternalStore } from 'react'
+import { useCallback, useMemo, useSyncExternalStore } from 'react'
 import Link from 'next/link'
 import { ExternalLink } from 'lucide-react'
 import { Switch } from '@/components/ui/switch'
+import { useCompanyOptional } from '@/contexts/CompanyContext'
 import {
   SettingsRow,
   SettingsRowEnd,
 } from '@/components/settings/SettingsRows'
 
 /**
- * Per-user toggle for the periodisering wizard's auto-detection step.
+ * Per-company toggle for the periodisering wizard's auto-detection step.
  *
- * Backed by localStorage (key: `periodisering_autodetect_enabled`) because
+ * Backed by localStorage (key: `periodisering_autodetect_enabled:<companyId>`,
+ * with the old unscoped key as a read fallback so existing choices survive:
+ * the unscoped key silently applied one company's choice to every company in
+ * the browser) because
  * the company_settings table does not yet have a dedicated column for this
  * preference, and the task description explicitly allows the persistence to
  * be UI-local. A future migration can promote this to a real
@@ -26,10 +30,16 @@ import {
  */
 const STORAGE_KEY = 'periodisering_autodetect_enabled'
 
-function readStored(): boolean {
+function storageKeyFor(companyId: string | null): string {
+  return companyId ? `${STORAGE_KEY}:${companyId}` : STORAGE_KEY
+}
+
+function readStored(companyId: string | null): boolean {
   if (typeof window === 'undefined') return true
   try {
-    const stored = window.localStorage.getItem(STORAGE_KEY)
+    const stored =
+      window.localStorage.getItem(storageKeyFor(companyId)) ??
+      window.localStorage.getItem(STORAGE_KEY)
     return stored === null ? true : stored !== 'false'
   } catch {
     return true
@@ -42,7 +52,7 @@ function readStored(): boolean {
 function subscribe(callback: () => void): () => void {
   if (typeof window === 'undefined') return () => {}
   const handler = (e: StorageEvent) => {
-    if (e.key === STORAGE_KEY || e.key === null) callback()
+    if (e.key === null || e.key === STORAGE_KEY || e.key.startsWith(`${STORAGE_KEY}:`)) callback()
   }
   const customHandler = () => callback()
   window.addEventListener('storage', handler)
@@ -61,9 +71,11 @@ function notifyChange() {
 }
 
 export function PeriodiseringAutoDetectToggle() {
+  const companyId = useCompanyOptional()?.company?.id ?? null
+  const getSnapshot = useMemo(() => () => readStored(companyId), [companyId])
   const enabled = useSyncExternalStore(
     subscribe,
-    readStored,
+    getSnapshot,
     // Server snapshot: default to enabled. Matches the client default so
     // hydration is identical.
     () => true,
@@ -71,12 +83,12 @@ export function PeriodiseringAutoDetectToggle() {
 
   const handleChange = useCallback((value: boolean) => {
     try {
-      window.localStorage.setItem(STORAGE_KEY, String(value))
+      window.localStorage.setItem(storageKeyFor(companyId), String(value))
     } catch {
       // No-op; if storage is blocked the toggle simply won't persist.
     }
     notifyChange()
-  }, [])
+  }, [companyId])
 
   return (
     <SettingsRow