feat: add header icons to all dashboard panels

Consistent icon treatment across Pages, Referrers, Locations,
Technology, Campaigns, Peak Hours, Goals, and Search panels.

components/dashboard/GoalStats.tsx

@@ -2,6 +2,7 @@
 
 import Link from 'next/link'
 import { formatNumber } from '@ciphera-net/ui'
+import { Target } from '@phosphor-icons/react'
 import { BookOpenIcon, ArrowRightIcon } from '@ciphera-net/ui'
 import type { GoalCountStat } from '@/lib/api/stats'
 
@@ -21,9 +22,12 @@ export default function GoalStats({ goalCounts, onSelectEvent }: GoalStatsProps)
   return (
     <div className="bg-white dark:bg-neutral-900 border border-neutral-200 dark:border-neutral-800 rounded-2xl p-6 h-full flex flex-col">
       <div className="flex items-center justify-between mb-4">
-        <h3 className="text-lg font-semibold text-neutral-900 dark:text-white">
-          Goals & Events
-        </h3>
+        <div className="flex items-center gap-2">
+          <Target className="w-5 h-5 text-neutral-400 dark:text-neutral-500" weight="bold" />
+          <h3 className="text-lg font-semibold text-neutral-900 dark:text-white">
+            Goals & Events
+          </h3>
+        </div>
       </div>
 
       {hasData ? (