Retire le bouton "Nouveau round" du Conseil des Archontes

Un seul round sur toute la semaine : plus besoin de pouvoir
réinitialiser le repère de classement depuis l'admin. La logique des
flèches de progression (previous_rank, reset_rank_reference) reste en
place, simplement plus rien ne la déclenche.

src/app/admin/page.tsx

@@ -1,7 +1,6 @@
 import { redirect } from "next/navigation";
 import { createClient } from "@/lib/supabase/server";
 import { AdminMembersTable } from "./admin-members-table";
-import { ResetRoundButton } from "./reset-round-button";
 
 export default async function AdminPage() {
   const supabase = await createClient();
@@ -32,15 +31,12 @@ export default async function AdminPage() {
 
   return (
     <div className="mx-auto w-full max-w-3xl px-4 py-8">
-      <div className="mb-6 flex flex-wrap items-center justify-between gap-3">
-        <div>
+      <div className="mb-6">
         <h1 className="font-heading text-2xl tracking-[0.1em] text-gold-bright uppercase">
           Le Conseil des Archontes
         </h1>
         <p className="font-serif text-sm text-marble/60 italic">Administration des Citoyens</p>
       </div>
-        <ResetRoundButton />
-      </div>
       <AdminMembersTable members={members ?? []} currentUserId={user.id} />
     </div>
   );

src/app/admin/reset-round-button.tsx

@@ -1,29 +0,0 @@
-"use client";
-
-import { useState } from "react";
-import { createClient } from "@/lib/supabase/client";
-
-export function ResetRoundButton() {
-  const [state, setState] = useState<"idle" | "loading" | "done">("idle");
-
-  async function handleClick() {
-    setState("loading");
-    const supabase = createClient();
-    const { error } = await supabase.rpc("reset_rank_reference");
-    setState(error ? "idle" : "done");
-    if (!error) {
-      setTimeout(() => setState("idle"), 2000);
-    }
-  }
-
-  return (
-    <button
-      type="button"
-      onClick={handleClick}
-      disabled={state === "loading"}
-      className="marble-surface rounded-md border border-gold/40 px-3 py-1.5 text-sm font-medium text-text-marble shadow-sm transition hover:bg-gold/10 disabled:opacity-50"
-    >
-      {state === "loading" ? "…" : state === "done" ? "Repère mis à jour ✓" : "Nouveau round (réinitialiser le repère)"}
-    </button>
-  );
-}