Add business dashboard dark mode from Super Admin theme setting.

Login and in-app surfaces follow tenant themeMode, matching customer dark tokens, with themed switches and tighter card/table chrome.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/business/src/components/ProductDetailsTabs.module.css

@@ -37,7 +37,7 @@
 
 .tabActive {
   color: var(--primary);
-  background: rgba(255, 255, 255, 0.75);
+  background: var(--surface);
   box-shadow: inset 0 -2px 0 var(--primary);
 }
 
@@ -118,7 +118,7 @@
 .comment,
 .review {
   padding: 14px 16px;
-  background: rgba(255, 255, 255, 0.65);
+  background: var(--surface);
   border: 1px solid rgba(148, 163, 184, 0.2);
   border-radius: var(--radius-sm);
 }