refactor(ui): strip all dark: Tailwind classes (single-theme product)

Mechanical sweep of 41 files via `perl -i -pe 's{\s+dark:[\w:/\[\]\.\-]+}{}g'`.
All dark: variants were paired with light-mode counterparts already; no
elements relied on a dark:-only style.

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

src/components/dashboard/smart-actions.tsx

@@ -33,19 +33,19 @@ const severityConfig = {
   critical: {
     icon: AlertTriangle,
     iconClass: 'text-red-600',
-    bgClass: 'bg-red-50 dark:bg-red-950/30',
+    bgClass: 'bg-red-50',
     borderClass: 'border-l-red-500',
   },
   warning: {
     icon: AlertCircle,
     iconClass: 'text-amber-600',
-    bgClass: 'bg-amber-50 dark:bg-amber-950/30',
+    bgClass: 'bg-amber-50',
     borderClass: 'border-l-amber-500',
   },
   info: {
     icon: Info,
     iconClass: 'text-blue-600',
-    bgClass: 'bg-blue-50 dark:bg-blue-950/30',
+    bgClass: 'bg-blue-50',
     borderClass: 'border-l-blue-500',
   },
 }
@@ -54,8 +54,8 @@ export function SmartActions({ actions }: SmartActionsProps) {
   return (
     <Card>
       <CardHeader className="flex flex-row items-center gap-3 space-y-0 pb-4">
-        <div className="flex h-9 w-9 items-center justify-center rounded-lg bg-amber-100 dark:bg-amber-900/40">
-          <Zap className="h-5 w-5 text-amber-600 dark:text-amber-400" />
+        <div className="flex h-9 w-9 items-center justify-center rounded-lg bg-amber-100">
+          <Zap className="h-5 w-5 text-amber-600" />
         </div>
         <CardTitle className="flex-1">Action Required</CardTitle>
         {actions.length > 0 && (
@@ -65,8 +65,8 @@ export function SmartActions({ actions }: SmartActionsProps) {
       <CardContent>
         {actions.length === 0 ? (
           <div className="flex flex-col items-center justify-center py-8 text-center">
-            <div className="flex h-12 w-12 items-center justify-center rounded-full bg-emerald-100 dark:bg-emerald-900/40">
-              <CheckCircle2 className="h-6 w-6 text-emerald-600 dark:text-emerald-400" />
+            <div className="flex h-12 w-12 items-center justify-center rounded-full bg-emerald-100">
+              <CheckCircle2 className="h-6 w-6 text-emerald-600" />
             </div>
             <p className="mt-3 text-sm font-medium text-muted-foreground">
               All caught up!