feat(mcp): payroll e2e parity: staged salary-run booking + absence deletion (#1075)

* feat(mcp): payroll e2e parity: staged salary-run booking + absence deletion

Close the last MCP-surface gaps for running payroll end-to-end via the
connector (the v1 REST API already had the full chain):

- gnubok_book_salary_run: stages a high-risk book operation; on approval
  the executor walks review -> approved -> paid -> booked via the new
  lib/salary/book-run.ts (extracted from the dashboard book route, which
  now calls the same core) and posts the immutable salary vouchers.
- gnubok_delete_absence: staged inverse of gnubok_register_absence,
  reusing deleteAbsenceRange with a dry-run day-count preview.
- Wire the missing payroll operation types into the Granskning label map
  (register_absence, update_payslip_line, employee ops, vacation_year_close
  had translations but fell back to humanized snake_case).
- Update stale 'booking happens in the web UI' prose in tool descriptions,
  the payroll-monthly skill, and the workflow hint; payload-size ceiling
  56K -> 57K per the documented bump protocol.

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

* fix(mcp): widen pending_operations op-type CHECK + roster typing for book_salary_run

The op-type audit (pg-real) caught the exact bug class it exists for:
book_salary_run and delete_absence were staged in code without the
constraint-expansion migration, so every real staging INSERT would have
failed with check_violation while dry_run previewed clean. Ships the
documented widen (NOT VALID) + validate migration pair. Also fixes the
strict-mode cast in book-run.ts that failed the production typecheck.

Verified locally against supabase/postgres 15.8.1.060 with all migrations
applied: op-type audit green, pg-real 692/693 (the one failure is the
pre-existing TZ-sensitive get_unlinked_1930_lines assertion, green under
TZ=UTC as in CI).

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

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

lib/errors/structured-errors.ts

@@ -2100,6 +2100,11 @@ const SALARY: Record<string, StructuredErrorEntry> = {
     message_sv: 'Lönekörningen måste vara markerad som betald för bokföring.',
     message_en: 'Salary run must be marked paid before booking.',
   },
+  SALARY_RUN_ALREADY_BOOKED: {
+    httpStatus: 409,
+    message_sv: 'Lönekörningen är redan bokförd.',
+    message_en: 'Salary run is already booked.',
+  },
   SALARY_PAYSLIPS_SEND_INVALID_STATUS: {
     httpStatus: 400,
     message_sv: 'Lönespecifikationer kan bara skickas efter godkännande.',