fix(configurator): Process Composer dark-mode palette (Sub 3 follow-up)

Process Composer was rendering a white card background on dark-mode
tenants because the SCSS relied on var(--bs-body-bg, #ffffff) — the
Bootstrap CSS variable doesn't flip reliably in Odoo 19's backend,
and the hardcoded fallback kicked in.

Rewrote with the shopfloor token pattern from CLAUDE.md: branch on
$o-webclient-color-scheme == dark at compile time, expose via CSS
custom properties (--fp-composer-card / -border / -panel / -text /
-muted), drop every --bs-* fallback for layout colours.

Cleared the ir_attachment asset cache on entech so both the backend
and web_dark bundles recompile cleanly.

fusion_plating_configurator → 19.0.12.1.0

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

fusion_plating/fusion_plating_configurator/__manifest__.py

@@ -5,7 +5,7 @@
 
 {
     'name': 'Fusion Plating — Configurator',
-    'version': '19.0.12.0.0',
+    'version': '19.0.12.1.0',
     'category': 'Manufacturing/Plating',
     'summary': 'Quotation configurator with part catalog, coating configs, and formula-based pricing engine.',
     'description': """