feat: Add PWA support and consolidate CSS design system

- Add PWA manifest, icons (192x192, 512x512), and service worker
- Register service worker in index.html with Apple mobile web app support
- Consolidate CSS variables and design tokens documentation
- Update PrimeVue overrides for consistent theming
- Refactor data-entry components to use shared CSS patterns
- Add frontend-style-auditor agent for style consistency checks
- Minor OCR validation and job worker improvements
- Update start-prod.sh configuration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/modules/reports/components/dashboard/DetailedDataTable.vue

@@ -580,7 +580,7 @@ watch(
 }
 
 .detailed-table th {
-  background: #ffffff;
+  background: var(--surface-card);
   font-weight: 500;
   color: var(--color-text-primary);
   position: sticky;
@@ -592,7 +592,7 @@ watch(
 
 /* Group row styling */
 .group-row {
-  background: #ffffff;
+  background: var(--surface-card);
   cursor: pointer;
   font-weight: 500;
   border-top: 1px solid var(--color-border);
@@ -600,26 +600,26 @@ watch(
 }
 
 .group-row:hover {
-  background: #f8f9fa;
+  background: var(--surface-hover);
 }
 
 .group-row.has-restant:hover {
-  background: #f8f9fa;
+  background: var(--surface-hover);
 }
 
 /* Single invoice row styling */
 .single-invoice-row {
-  background: #ffffff;
+  background: var(--surface-card);
   font-weight: 400;
   transition: background 0.15s ease;
 }
 
 .single-invoice-row:hover {
-  background: #f8f9fa;
+  background: var(--surface-hover);
 }
 
 .single-invoice-row.row-restant:hover {
-  background: #f8f9fa;
+  background: var(--surface-hover);
 }
 
 .single-invoice-row td:first-child {