Scaffold V1: auth, profils et leaderboard

Next.js 16 + Tailwind + Supabase (Auth, Postgres, Storage). Connexion
par pseudo/mot de passe via email interne dérivé, RLS avec points
protégés au niveau colonne, pages login/signup/leaderboard/profile.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/app/profile/profile-form.tsx

@@ -0,0 +1,131 @@
+"use client";
+
+import { useRouter } from "next/navigation";
+import { useState, type FormEvent } from "react";
+import { createClient } from "@/lib/supabase/client";
+import { slugify } from "@/lib/auth";
+import { Avatar } from "@/components/avatar";
+
+function mapError(message: string): string {
+  if (message.includes("duplicate key")) {
+    return "Ce pseudo est déjà pris.";
+  }
+  return "Une erreur est survenue, réessaie.";
+}
+
+export function ProfileForm({
+  userId,
+  initialPseudo,
+  initialAvatarUrl,
+}: {
+  userId: string;
+  initialPseudo: string;
+  initialAvatarUrl: string | null;
+}) {
+  const router = useRouter();
+  const [pseudo, setPseudo] = useState(initialPseudo);
+  const [avatarUrl, setAvatarUrl] = useState(initialAvatarUrl);
+  const [avatarFile, setAvatarFile] = useState<File | null>(null);
+  const [error, setError] = useState<string | null>(null);
+  const [success, setSuccess] = useState(false);
+  const [loading, setLoading] = useState(false);
+
+  const previewUrl = avatarFile ? URL.createObjectURL(avatarFile) : avatarUrl;
+
+  async function handleSubmit(event: FormEvent) {
+    event.preventDefault();
+    setError(null);
+    setSuccess(false);
+
+    const slug = slugify(pseudo);
+    if (!slug) {
+      setError("Choisis un pseudo valide.");
+      return;
+    }
+
+    setLoading(true);
+    const supabase = createClient();
+
+    let nextAvatarUrl = avatarUrl;
+
+    if (avatarFile) {
+      const ext = avatarFile.name.split(".").pop() ?? "jpg";
+      const path = `${userId}.${ext}`;
+      const { error: uploadError } = await supabase.storage
+        .from("avatars")
+        .upload(path, avatarFile, { upsert: true });
+
+      if (uploadError) {
+        setLoading(false);
+        setError("Impossible d'envoyer la photo, réessaie.");
+        return;
+      }
+
+      const { data: publicUrlData } = supabase.storage.from("avatars").getPublicUrl(path);
+      nextAvatarUrl = `${publicUrlData.publicUrl}?t=${Date.now()}`;
+    }
+
+    const { error: updateError } = await supabase
+      .from("profiles")
+      .update({ pseudo, slug, avatar_url: nextAvatarUrl })
+      .eq("id", userId);
+
+    setLoading(false);
+
+    if (updateError) {
+      setError(mapError(updateError.message));
+      return;
+    }
+
+    setAvatarUrl(nextAvatarUrl);
+    setAvatarFile(null);
+    setSuccess(true);
+    router.refresh();
+  }
+
+  return (
+    <form onSubmit={handleSubmit} className="flex flex-col gap-4">
+      <div className="flex flex-col items-center gap-3">
+        <Avatar pseudo={pseudo || "?"} avatarUrl={previewUrl ?? null} size="lg" />
+        <label className="text-sm">
+          <span className="sr-only">Changer la photo</span>
+          <input
+            type="file"
+            accept="image/*"
+            onChange={(event) => setAvatarFile(event.target.files?.[0] ?? null)}
+            className="text-sm file:mr-3 file:rounded-md file:border-0 file:bg-navy file:px-3 file:py-1.5 file:text-ivory"
+          />
+        </label>
+      </div>
+
+      <div className="flex flex-col gap-1">
+        <label htmlFor="pseudo" className="text-sm font-medium">
+          Pseudo
+        </label>
+        <input
+          id="pseudo"
+          type="text"
+          required
+          value={pseudo}
+          onChange={(event) => setPseudo(event.target.value)}
+          className="rounded-md border border-navy/20 bg-white px-3 py-2 text-ink outline-none focus:border-gold"
+        />
+      </div>
+
+      {error && (
+        <p role="alert" className="text-sm text-red-700">
+          {error}
+        </p>
+      )}
+      {success && <p className="text-sm text-green-700">Profil mis à jour.</p>}
+
+      <button
+        type="submit"
+        disabled={loading}
+        className="mt-2 rounded-md bg-navy px-4 py-2 font-medium text-ivory transition hover:bg-navy/90 disabled:opacity-50"
+      >
+        {loading ? "Enregistrement…" : "Enregistrer"}
+      </button>
+    </form>
+  );
+}