fix: use sparkles icon for insight header

src/lib/components/AIInsightPanel.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
-  import BrainCircuitIcon from '@lucide/svelte/icons/brain-circuit';
   import RefreshCcwIcon from '@lucide/svelte/icons/refresh-ccw';
+  import SparklesIcon from '@lucide/svelte/icons/sparkles';
 
   import { ApiError, api, type AIInsight, type AIInsightModule } from '$lib/api/client';
   import { Badge } from '$lib/components/ui/badge';
@@ -108,7 +108,7 @@
       <CardHeader class="bg-primary/[.035] -mt-4 border-b pt-4">
         <div class="flex min-h-6 flex-wrap items-center justify-between gap-3">
           <CardTitle class="flex h-6 items-center gap-2 text-base leading-none">
-            <BrainCircuitIcon class="text-primary size-5" /> خلاصه ساده این صفحه
+            <SparklesIcon class="text-primary size-5" /> خلاصه ساده این صفحه
           </CardTitle>
           {#if periodLabel}<Badge class="h-6 leading-none" variant="secondary">{periodLabel}</Badge>{/if}
         </div>