Report: Chapter III heading + tabular-nums on worker breakdown table

Adds the numbered 'III' chapter heading above the existing Worker
Breakdown card (the widest table in the report). Promotes the table
to .report-numeric (tabular-nums) for perfect column alignment
across dynamic adjustment columns — Inter's tabular-nums variant
keeps the rand amounts pixel-aligned.

No data or structural changes to the breakdown itself.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

core/templates/core/report.html

@@ -294,6 +294,8 @@
     </div>
 </div>
 
+{# === CHAPTER III — Worker Breakdown === #}
+<h5 class="chapter-heading mb-3"><span class="chapter-num">III</span>Worker Breakdown</h5>
 <!-- Worker Breakdown -->
 <div class="card mb-4">
     <div class="card-header py-3">
@@ -302,7 +304,7 @@
     <div class="card-body p-0">
         {% if worker_breakdown %}
         <div class="table-responsive">
-            <table class="table table-sm mb-0">
+            <table class="table table-sm mb-0 report-numeric">
                 <thead>
                     <tr>
                         <th>Worker</th>