Move UI controls to bottom and require authentication for stats

- Moved stats button, auth buttons, and debug info to bottom of main page
- Added authentication requirement for /stats route
- Show login prompt for unauthenticated users accessing stats
- Include AuthModal for sign in/sign up from stats page

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

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

src/routes/stats/+page.server.ts

@@ -4,13 +4,20 @@ import { eq, desc } from 'drizzle-orm';
 import type { PageServerLoad } from './$types';
 
 export const load: PageServerLoad = async ({ url, locals }) => {
-	const userId = url.searchParams.get('userId');
-	const anonymousId = url.searchParams.get('anonymousId');
+	// Check if user is authenticated
+	if (!locals.user) {
+		return {
+			stats: null,
+			error: null,
+			user: null,
+			session: null,
+			requiresAuth: true
+		};
+	}
 	
-	// Prioritize userId (authenticated user) over anonymousId
-	const targetId = userId || anonymousId;
+	const userId = locals.user.id;
 	
-	if (!targetId) {
+	if (!userId) {
 		return {
 			stats: null,
 			error: 'No user ID provided',
@@ -24,7 +31,7 @@ export const load: PageServerLoad = async ({ url, locals }) => {
 		const completions = await db
 			.select()
 			.from(dailyCompletions)
-			.where(eq(dailyCompletions.anonymousId, targetId))
+			.where(eq(dailyCompletions.anonymousId, userId))
 			.orderBy(desc(dailyCompletions.date));
 
 		if (completions.length === 0) {