fix: remove middleware and route groups to fix Vercel deployment

- Remove middleware.ts entirely (caused __dirname ReferenceError in Edge)
- Auth protection handled by dashboard layout.tsx (server-side redirect)
- Move pages out of (marketing) and (auth) route groups to fix 404 on /
- Keep (protected) route group for dashboard/formations/profil shared layout

https://claude.ai/code/session_01H2aRGDaKgarPvhay2HxN6Y

app/(protected)/formations/[moduleId]/MarkCompleteButton.tsx

@@ -0,0 +1,83 @@
+"use client";
+
+import { useState } from "react";
+import { useRouter } from "next/navigation";
+import { createClient } from "@/lib/supabase/client";
+import Button from "@/components/ui/Button";
+
+interface MarkCompleteButtonProps {
+  moduleId: string;
+  userId: string;
+  isCompleted: boolean;
+}
+
+export default function MarkCompleteButton({
+  moduleId,
+  userId,
+  isCompleted: initialCompleted,
+}: MarkCompleteButtonProps) {
+  const router = useRouter();
+  const [loading, setLoading] = useState(false);
+  const [completed, setCompleted] = useState(initialCompleted);
+
+  const handleToggle = async () => {
+    setLoading(true);
+
+    try {
+      const supabase = createClient();
+
+      if (completed) {
+        // Marquer comme non complété
+        await (supabase
+          .from("user_progress")
+          .update({ completed: false, completed_at: null } as never)
+          .eq("user_id", userId)
+          .eq("module_id", moduleId));
+      } else {
+        // Marquer comme complété (upsert)
+        await (supabase.from("user_progress").upsert({
+          user_id: userId,
+          module_id: moduleId,
+          completed: true,
+          completed_at: new Date().toISOString(),
+        } as never));
+      }
+
+      setCompleted(!completed);
+      router.refresh();
+    } catch (err) {
+      console.error("Erreur mise a jour progression:", err);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  return (
+    <Button
+      onClick={handleToggle}
+      loading={loading}
+      variant={completed ? "secondary" : "primary"}
+    >
+      {completed ? (
+        <span className="flex items-center gap-2">
+          <svg
+            className="w-4 h-4 text-success"
+            fill="none"
+            stroke="currentColor"
+            viewBox="0 0 24 24"
+          >
+            <path
+              strokeLinecap="round"
+              strokeLinejoin="round"
+              strokeWidth={2}
+              d="M5 13l4 4L19 7"
+            />
+          </svg>
+          Complete - Annuler
+        </span>
+      ) : (
+        "Marquer comme complete"
+      )}
+    </Button>
+  );
+}