feat(ticket): add section icons, theme-aware system timeline, and nested sidebar active routes

src/app/(modules)/ticket/[ticketId]/components/TicketDefectClassTabs.tsx

@@ -2,7 +2,7 @@
 
 import { useEffect, useMemo, useState } from 'react';
 import { usePathname, useRouter, useSearchParams } from 'next/navigation';
-import { Component } from 'lucide-react';
+import { AlertTriangle, Component } from 'lucide-react';
 
 import { Badge } from '@/components/ui/badge';
 import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
@@ -89,6 +89,7 @@ export function TicketDefectClassTabs({
       <Card className="w-full">
         <CardHeader>
           <CardTitle className="flex items-center gap-2 text-base">
+            <AlertTriangle className="size-5 shrink-0 text-primary" />
             <span>Issues</span>
             <Badge
               variant="secondary"