Closes the Task 3 design-goal gap: two user-facing modals (work-log
payroll preview in base.html, split-payslip preview in
payroll_dashboard.html) render adjustment types via JS reading AJAX
JSON. After Task 3's TYPE_CHOICES rename they were still showing
the old long labels because the backend endpoints
(work_log_payroll_ajax, preview_payslip) only emitted adj.type (DB
value), not the display label.
Added a 'type_label' field to the JSON payloads alongside the
existing 'type' field. JS at both render sites now reads
`adj.type_label || adj.type` — with the fallback so any stale
client-side JSON degrades gracefully to the DB value rather than
rendering blank.
Path A still holds: adj.type in JSON stays the DB value for any
identifier purposes; the new type_label is additive.
Tests: 69/69.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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