feat: remove AI extensions, restructure settings, and add atomic voucher commits (#157)

Remove AI-dependent extensions (ai-chat, ai-categorization, receipt-ocr,
invoice-inbox) and their infrastructure (lib/ai/*, ai-consent, LangChain/
Anthropic/OpenAI deps) to simplify core and reduce bundle size.

Restructure monolithic settings page into dedicated sub-pages (company,
bookkeeping, invoicing, tax, banking, api, account, team, templates) with
shared layout and sidebar navigation.

Add atomic commit_journal_entry RPC so voucher number increment and status
update happen in a single transaction — prevents burned numbers on constraint
failures. Add continuity check report and voucher gap explanation tracking.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

types/index.ts

@@ -186,6 +186,21 @@ export interface CompanySettings {
   invoice_default_days: number
   invoice_default_notes: string | null
 
+  // Bookkeeping lock
+  bookkeeping_locked_through: string | null
+  auto_lock_period_days: number | null
+
+  // Invoice PDF settings
+  ore_rounding: boolean
+  invoice_show_ocr: boolean
+  invoice_show_bankgiro: boolean
+  invoice_show_plusgiro: boolean
+  invoice_late_fee_text: string | null
+  invoice_credit_terms_text: string | null
+
+  // Logo
+  logo_url: string | null
+
   // Onboarding
   onboarding_step: number
   onboarding_complete: boolean
@@ -1996,6 +2011,26 @@ export interface Project {
 export interface VoucherGap {
   gap_start: number
   gap_end: number
+  series: string
+}
+
+export interface VoucherGapExplanation {
+  id: string
+  company_id: string
+  user_id: string
+  fiscal_period_id: string
+  voucher_series: string
+  gap_start: number
+  gap_end: number
+  explanation: string
+  created_at: string
+  updated_at: string
+}
+
+export interface SequenceMismatch {
+  series: string
+  sequenceCounter: number
+  actualMax: number
 }
 
 // ============================================================
@@ -2008,6 +2043,8 @@ export interface YearEndValidation {
   warnings: string[]
   draftCount: number
   voucherGaps: VoucherGap[]
+  unexplainedGaps: VoucherGap[]
+  sequenceMismatches: SequenceMismatch[]
   trialBalanceBalanced: boolean
 }
 
@@ -2027,6 +2064,26 @@ export interface YearEndResult {
   revaluationEntry: JournalEntry | null
 }
 
+// ============================================================
+// IB/UB Continuity Check Types (Avstämning ingående/utgående balans)
+// ============================================================
+
+export interface ContinuityDiscrepancy {
+  account_number: string
+  account_name: string
+  previous_ub_net: number
+  current_ib_net: number
+  difference: number
+}
+
+export interface ContinuityCheckResult {
+  valid: boolean
+  period_name: string
+  previous_period_name: string | null
+  discrepancies: ContinuityDiscrepancy[]
+  checked_accounts: number
+}
+
 // ============================================================
 // Currency Revaluation Types (Omvärdering utländsk valuta)
 // ============================================================