Initial project setup for PhaseFlow

Set up Next.js 16 project with TypeScript for a training decision app
that integrates menstrual cycle phases with Garmin biometrics for
Hashimoto's thyroiditis management.

Stack: Next.js 16, React 19, Tailwind/shadcn, PocketBase, Drizzle,
Zod, Resend, Vitest, Biome, Lefthook, Nix dev environment.

Includes:
- 7 page routes (dashboard, login, settings, calendar, history, plan)
- 12 API endpoints (garmin, user, cycle, calendar, overrides, cron)
- Core lib utilities (decision engine, cycle phases, nutrition, ICS)
- Type definitions and component scaffolding
- Python script for Garmin token bootstrapping
- Initial unit tests for cycle utilities

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/login/page.tsx

@@ -0,0 +1,13 @@
+// ABOUTME: Login page for user authentication.
+// ABOUTME: Provides email/password login form using PocketBase auth.
+export default function LoginPage() {
+  return (
+    <div className="flex min-h-screen items-center justify-center">
+      <div className="w-full max-w-md space-y-8 p-8">
+        <h1 className="text-2xl font-bold text-center">PhaseFlow Login</h1>
+        {/* Login form will be implemented here */}
+        <p className="text-center text-gray-500">Login form placeholder</p>
+      </div>
+    </div>
+  );
+}