first commit

frontend/src/pages/LoginPage.tsx

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+import { FormEvent, useState } from "react";
+import { useNavigate } from "react-router-dom";
+import { toast } from "sonner";
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "../components/ui/card";
+import { Button } from "../components/ui/button";
+import { Input } from "../components/ui/input";
+import { Label } from "../components/ui/label";
+import { useAuth } from "../providers/auth-provider";
+import { ThemeToggle } from "../components/ThemeToggle";
+
+export function LoginPage() {
+  const { login } = useAuth();
+  const navigate = useNavigate();
+  const [username, setUsername] = useState("");
+  const [password, setPassword] = useState("");
+  const [loading, setLoading] = useState(false);
+
+  const handleSubmit = async (e: FormEvent) => {
+    e.preventDefault();
+    setLoading(true);
+    try {
+      await login(username, password);
+      navigate("/admin", { replace: true });
+    } catch (err) {
+      toast.error("Giriş başarısız. Bilgileri kontrol edin.");
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-background px-4">
+      <div className="absolute right-6 top-6">
+        <ThemeToggle />
+      </div>
+      <Card className="w-full max-w-md border-border card-shadow">
+        <CardHeader>
+          <CardTitle>Yönetici Girişi</CardTitle>
+          <CardDescription>Panel erişimi için bilgilerinizi girin.</CardDescription>
+        </CardHeader>
+        <CardContent>
+          <form className="space-y-4" onSubmit={handleSubmit}>
+            <div className="space-y-2">
+              <Label htmlFor="username">Kullanıcı adı</Label>
+              <Input
+                id="username"
+                value={username}
+                onChange={(e) => setUsername(e.target.value)}
+                placeholder="admin"
+                required
+              />
+            </div>
+            <div className="space-y-2">
+              <Label htmlFor="password">Şifre</Label>
+              <Input
+                id="password"
+                type="password"
+                value={password}
+                onChange={(e) => setPassword(e.target.value)}
+                placeholder="••••••••"
+                required
+              />
+            </div>
+            <Button type="submit" className="w-full" disabled={loading}>
+              {loading ? "Giriş yapılıyor..." : "Giriş Yap"}
+            </Button>
+          </form>
+        </CardContent>
+      </Card>
+    </div>
+  );
+}