chore: Implement route protection and security enhancements

- Add src/middleware.ts for global route proection
- Whitelist public routes (/, /auth/*, /splits/[slug])
- Add redirect logic to Home page for returning users
- Fix minor lint issues in Home page

src/app/page.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useEffect, useState } from 'react';
-import { useRouter } from 'next/navigation';
+import { useRouter, useSearchParams } from 'next/navigation';
 import { createClient } from '@/lib/supabase/client';
 import BottleGrid from "@/components/BottleGrid";
 import AuthForm from "@/components/AuthForm";
@@ -11,7 +11,7 @@ import { useI18n } from "@/i18n/I18nContext";
 import { useAuth } from "@/context/AuthContext";
 import { useSession } from "@/context/SessionContext";
 import TastingHub from "@/components/TastingHub";
-import { Sparkles, Loader2, Search, SlidersHorizontal } from "lucide-react";
+import { Sparkles, Loader2, Search, SlidersHorizontal, Settings, CircleUser } from "lucide-react";
 import { BottomNavigation } from '@/components/BottomNavigation';
 import ScanAndTasteFlow from '@/components/ScanAndTasteFlow';
 import UserStatusBadge from '@/components/UserStatusBadge';
@@ -20,10 +20,12 @@ import SplitCard from '@/components/SplitCard';
 import HeroBanner from '@/components/HeroBanner';
 import QuickActionsGrid from '@/components/QuickActionsGrid';
 import DramOfTheDay from '@/components/DramOfTheDay';
+import { checkIsAdmin } from '@/services/track-api-usage';
 
 export default function Home() {
     const supabase = createClient();
     const router = useRouter();
+    const searchParams = useSearchParams();
     const [bottles, setBottles] = useState<any[]>([]);
     const { user, isLoading: isAuthLoading } = useAuth();
     const [isInternalLoading, setIsInternalLoading] = useState(false);