feat: support contact links and SIE import UX polish (#138)

* 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>

* feat: add support contact links and improve SIE import UX

Add a SupportLink component with a contact dialog throughout the app
(nav, help page, settings, MFA, error pages, empty states). Improve
SIE import flow with phased loading states, structured skip breakdowns,
and an elapsed-time counter. Fix MFA enroll stale factor cleanup and
URL encoding for settings return path.

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

* fix: address PR review — open redirect, XSS, test cleanup, fallback email

- Validate returnTo is a relative path in MFA enroll (prevents open redirect)
- Add afterEach import to event-log-handler tests (fixes handler leak)
- HTML-escape user-supplied subject and message in support email body
- Replace hardcoded personal email with support@gnubok.se fallback

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

---------

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

lib/events/handlers/__tests__/event-log-handler.test.ts

@@ -1,4 +1,4 @@
-import { describe, it, expect, vi, beforeEach } from 'vitest'
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest'
 import { eventBus } from '@/lib/events/bus'
 import { makeTransaction, makeInvoice, makeCustomer, makeFiscalPeriod } from '@/tests/helpers'
 

lib/support.ts

@@ -0,0 +1,5 @@
+/**
+ * Support recipient — server-side only.
+ * Used by the /api/support/contact route. Never exposed to the client.
+ */
+export const SUPPORT_RECIPIENT_EMAIL = process.env.SUPPORT_RECIPIENT_EMAIL || 'support@gnubok.se'