The book flow never populated pension_contribution/pension_slp, so a
gross_deduction_pension line item reduced the salary entry but the
7410/2740 pension provision and 7533/2514 SLP lines were never posted.
Derive both at the createSalaryRunEntries boundary from the run's frozen
calculation_params.slpRate snapshot so the dashboard, MCP and v1 booking
paths all emit the pension verifikat, and reuse the exact 1.058 factor
via calculateLoneVaxlingPensionProvision shared with the planning
calculator.
Fixes#317
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>