fix(plating): border the CoC signature/statement table

My prior change removed the .cert-statement-box border but the signature +
statement table was never bordered, leaving the whole section borderless.
Add class="bordered" so the two main columns (Certified By | Certification
Statement) get the outer box + divider like the other report tables; the
statement text keeps no separate inner box. Bump reports 19.0.11.28.2.

Deployed on entech (fusion_plating_reports upgrade clean).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

fusion_plating/fusion_plating_reports/__manifest__.py

@@ -3,7 +3,7 @@
 # License OPL-1 (Odoo Proprietary License v1.0)
 {
     'name': 'Fusion Plating — Reports',
-    'version': '19.0.11.28.1',
+    'version': '19.0.11.28.2',
     'category': 'Manufacturing/Plating',
     'summary': 'PDF reports for Fusion Plating: quote, SO, WO, packing, BoL, CoC, invoice, receipt, quality + compliance.',
     'depends': [