feat: add login page and auth API route

src/app/api/auth/[...nextauth]/route.ts

@@ -0,0 +1,4 @@
+import { handlers } from "@/auth";
+
+export const GET = handlers.GET;
+export const POST = handlers.POST;

src/app/login/page.tsx

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+"use client";
+
+import { signIn } from "next-auth/react";
+import { useState } from "react";
+
+export default function LoginPage() {
+  const [email, setEmail] = useState("");
+  const [loading, setLoading] = useState(false);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+    setLoading(true);
+    await signIn("email", { email });
+    setLoading(false);
+  };
+
+  return (
+    <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-rose-50 to-amber-50">
+      <div className="w-full max-w-md p-8">
+        <h1 className="text-3xl font-bold text-center mb-2">Tia</h1>
+        <p className="text-center text-gray-600 mb-8">Your baby tracking companion</p>
+
+        <form onSubmit={handleSubmit} className="space-y-4">
+          <input
+            type="email"
+            placeholder="Your email"
+            value={email}
+            onChange={(e) => setEmail(e.target.value)}
+            className="w-full p-4 border rounded-2xl bg-white shadow-sm focus:ring-2 focus:ring-rose-200 outline-none"
+            required
+          />
+          <button
+            type="submit"
+            disabled={loading}
+            className="w-full p-4 bg-rose-400 text-white rounded-2xl font-medium shadow-md hover:bg-rose-500 transition disabled:opacity-50"
+          >
+            {loading ? "Sending..." : "Send Magic Link"}
+          </button>
+        </form>
+      </div>
+    </div>
+  );
+}

src/auth.ts

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+import NextAuth from "next-auth";
+import { DrizzleAdapter } from "@auth/drizzle-adapter";
+import { db } from "@/db";
+import { accounts, sessions, users, verificationTokens } from "@/db/schema/auth";
+
+export const { handlers, auth, signIn, signOut } = NextAuth({
+  adapter: DrizzleAdapter(db, {
+    accountsTable: accounts,
+    sessionsTable: sessions,
+    usersTable: users,
+    verificationTokensTable: verificationTokens,
+  }),
+  providers: [],
+  pages: {
+    signIn: "/login",
+  },
+  session: {
+    strategy: "database",
+    maxAge: 30 * 24 * 60 * 60,
+  },
+});

src/middleware.ts

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+import { NextResponse } from "next/server";
+import type { NextRequest } from "next/server";
+
+export function middleware(request: NextRequest) {
+  // For now, just log and continue - auth setup comes later
+  return NextResponse.next();
+}
+
+export const config = {
+  matcher: ["/((?!login|verify|api/auth|_next|static|favicon.ico).*)"],
+};