feat: apply various dashboard and auth fixes including demo trials, settings UI, and signup options

src/app/dashboard/ai-coach/layout.tsx

@@ -0,0 +1,14 @@
+import React from "react"
+import { PremiumGate } from "@/components/PremiumGate"
+
+export default function AICoachLayout({
+  children,
+}: {
+  children: React.ReactNode
+}) {
+  return (
+    <PremiumGate featureKey="ai-tutor-chat">
+      {children}
+    </PremiumGate>
+  )
+}