feat: event log, pending operations, and MCP staging (#135)

* feat: event log, pending operations, and MCP staging

- Event log system: persist bus events to event_log table for external
  automation platforms. Batch insert for transaction.synced. Daily
  cleanup cron at 02:00 UTC.
- Pending operations: MCP write tools (categorize, create customer,
  create invoice) now stage to pending_operations instead of executing
  directly. Users review and commit/reject from /pending in the web UI.
- Granskning page: card-based review UI with expandable previews,
  commit/reject dialogs. Only shown in nav when pending ops exist.
- Commit route re-executes using core lib functions (no extension
  imports). Guards against stale state (double-commit, deleted entities).

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

* feat: stage new MCP write tools after main merge

Add staging for 4 new write tools from #133:
- mark_invoice_paid, send_invoice, mark_invoice_sent,
  match_transaction_invoice
- Expand pending_operations CHECK constraint
- Add commit executors with full execution logic
- Add UI labels and generic preview component
- Remove confirm parameter from categorize (single-call staging)
- Fix UUID in pending op title (fetch transaction description)
- Hide Granskning nav when no pending ops

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

* fix: address PR review feedback

- Fix TS build error: use `select('*, customer:customers(*)')` for
  match_transaction_invoice to avoid array type inference
- Add status guard to commitSendInvoice (prevents duplicate sends)
- Replace auth.admin.getUserById with user email from session auth
- Restore optimistic lock check in commitMatchTransactionInvoice
- Fix tool description typo: expense_software → expense_office

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

---------

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

types/index.ts

@@ -1069,6 +1069,25 @@ export interface CreateFiscalPeriodInput {
   period_end: string
 }
 
+// ── Pending Operations ────────────────────────────────────────
+
+export type PendingOperationType = 'categorize_transaction' | 'create_customer' | 'create_invoice' | 'mark_invoice_paid' | 'send_invoice' | 'mark_invoice_sent' | 'match_transaction_invoice'
+export type PendingOperationStatus = 'pending' | 'committed' | 'rejected'
+
+export interface PendingOperation {
+  id: string
+  user_id: string
+  operation_type: PendingOperationType
+  status: PendingOperationStatus
+  title: string
+  params: Record<string, unknown>
+  preview_data: Record<string, unknown>
+  result_data: Record<string, unknown> | null
+  created_at: string
+  resolved_at: string | null
+  updated_at: string
+}
+
 // Onboarding progress for new user checklist
 export interface OnboardingProgress {
   hasCustomers: boolean