Corrige la suppression d'adhérent (FK) et intègre le vrai logo

- deleteMember: supprime d'abord les promotions liées et détache les comptes
  utilisateurs (transaction) avant de supprimer l'adhérent, ce qui évite la
  violation de clé étrangère (erreur serveur au clic « Supprimer »).
- Logo: remplace le SVG provisoire par le logo officiel (public/assets/logo.png)
  et met à jour toutes les références (accueil, login, backend, favicon).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XwfhYHzC9hQWPDnQ2p53GL

src/app/backend/BackendShell.tsx

@@ -76,7 +76,7 @@ export function BackendShell({
         <div style={{ display: "flex", alignItems: "center", gap: 11, padding: "6px 8px 22px" }}>
           <span style={{ display: "inline-flex", background: "#F6F2E8", borderRadius: 11, padding: 6 }}>
             {/* eslint-disable-next-line @next/next/no-img-element */}
-            <img src="/assets/logo.svg" alt="Plein R" style={{ height: 34, width: "auto", display: "block" }} />
+            <img src="/assets/logo.png" alt="Plein R" style={{ height: 34, width: "auto", display: "block" }} />
           </span>
           <div>
             <div className="font-display" style={{ fontWeight: 800, fontSize: 17, color: "#fff", lineHeight: 1 }}>

src/app/backend/actions.ts

@@ -129,7 +129,13 @@ export async function deleteMember(formData: FormData) {
   if (!can(role, "manageMembers")) throw new Error("Accès refusé");
   const id = Number(formData.get("id"));
   if (!id) return;
-  await db.delete(members).where(eq(members.id, id));
+  // Remove dependent rows first to satisfy foreign-key constraints:
+  // delete the member's promotions and detach any linked user account.
+  await db.transaction(async (tx) => {
+    await tx.delete(promotions).where(eq(promotions.memberId, id));
+    await tx.update(users).set({ memberId: null }).where(eq(users.memberId, id));
+    await tx.delete(members).where(eq(members.id, id));
+  });
   revalidatePath("/backend/adherents");
   revalidatePath("/");
 }

src/app/layout.tsx

@@ -25,7 +25,7 @@ export default function RootLayout({
           href="https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:opsz,wght@12..96,400;12..96,600;12..96,700;12..96,800&family=Public+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap"
           rel="stylesheet"
         />
-        <link rel="icon" href="/assets/logo.svg" type="image/svg+xml" />
+        <link rel="icon" href="/assets/logo.png" type="image/png" />
       </head>
       <body>{children}</body>
     </html>

src/app/login/page.tsx

@@ -25,7 +25,7 @@ export default function LoginPage() {
       <div style={{ width: "100%", maxWidth: 420 }}>
         <div style={{ textAlign: "center", marginBottom: 22 }}>
           {/* eslint-disable-next-line @next/next/no-img-element */}
-          <img src="/assets/logo.svg" alt="Plein R" style={{ height: 92, width: "auto" }} />
+          <img src="/assets/logo.png" alt="Plein R" style={{ height: 92, width: "auto" }} />
         </div>
 
         <div

src/app/page.tsx

@@ -47,7 +47,7 @@ export default async function AccueilPage() {
       >
         <Link href="/" style={{ display: "flex", alignItems: "center", gap: 10, textDecoration: "none" }}>
           {/* eslint-disable-next-line @next/next/no-img-element */}
-          <img src="/assets/logo.svg" alt="Plein R" style={{ height: 44, width: "auto" }} />
+          <img src="/assets/logo.png" alt="Plein R" style={{ height: 44, width: "auto" }} />
           <span className="font-display" style={{ fontWeight: 800, fontSize: 20, color: "#13324F" }}>
             Plein R
           </span>
@@ -96,7 +96,7 @@ export default async function AccueilPage() {
           <div style={{ display: "flex", justifyContent: "center", alignItems: "center" }}>
             {/* eslint-disable-next-line @next/next/no-img-element */}
             <img
-              src="/assets/logo.svg"
+              src="/assets/logo.png"
               alt="Plein R — Association des commerçants et entreprises du Bassin de Pompey"
               className="floatlogo"
               style={{
@@ -571,7 +571,7 @@ export default async function AccueilPage() {
         >
           <div style={{ display: "flex", alignItems: "center", gap: 10 }}>
             {/* eslint-disable-next-line @next/next/no-img-element */}
-            <img src="/assets/logo.svg" alt="Plein R" style={{ height: 36, width: "auto" }} />
+            <img src="/assets/logo.png" alt="Plein R" style={{ height: 36, width: "auto" }} />
             <span className="font-display" style={{ fontWeight: 800, fontSize: 16, color: "#13324F" }}>
               Plein R
             </span>