Initial commit: WrestleDesk full project

- Django backend with DRF (clubs, wrestlers, trainers, exercises, templates, trainings, homework, locations, leistungstest)
- Next.js 16 frontend with React, Shadcn UI, Tailwind
- JWT authentication
- Full CRUD for all entities
- Calendar view for trainings
- Homework management system
- Leistungstest tracking

frontend/src/app/(dashboard)/layout.tsx

@@ -0,0 +1,51 @@
+"use client"
+
+import { useEffect, useState } from "react"
+import { useRouter, usePathname } from "next/navigation"
+import { useAuth } from "@/lib/auth"
+import { Loader2 } from "lucide-react"
+import { Sidebar } from "@/components/layout/Sidebar"
+
+export default function DashboardLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  const router = useRouter()
+  const pathname = usePathname()
+  const { token, isHydrated } = useAuth()
+  const [checked, setChecked] = useState(false)
+
+  useEffect(() => {
+    if (!isHydrated) return
+    
+    if (!token) {
+      router.push("/login")
+    } else {
+      setChecked(true)
+    }
+  }, [isHydrated, token, router])
+
+  if (!isHydrated || !checked) {
+    return (
+      <div className="min-h-screen flex items-center justify-center bg-background">
+        <Loader2 className="w-8 h-8 animate-spin text-primary" />
+      </div>
+    )
+  }
+
+  if (!token) {
+    return null
+  }
+
+  return (
+    <div className="flex min-h-screen bg-background">
+      <Sidebar />
+      <main className="flex-1 min-h-screen">
+        <div className="p-8 h-full">
+          {children}
+        </div>
+      </main>
+    </div>
+  )
+}