diff --git a/apps/web/src/api/client.test.ts b/apps/web/src/api/client.test.ts
index a003086..1f8ccf8 100644
--- a/apps/web/src/api/client.test.ts
+++ b/apps/web/src/api/client.test.ts
@@ -1,5 +1,9 @@
-import { describe, expect, it } from "vitest";
-import { ApiFallbackError, getApiFallback } from "./client";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { api, ApiFallbackError, getApiFallback } from "./client";
+
+afterEach(() => {
+  vi.unstubAllGlobals();
+});
 
 describe("api fallback helpers", () => {
   it("extracts typed fallback payloads", () => {
@@ -9,4 +13,21 @@ describe("api fallback helpers", () => {
   it("ignores non fallback errors", () => {
     expect(getApiFallback<string[]>(new Error("boom"))).toBeUndefined();
   });
+
+  it("does not send JSON content-type for bodyless delete requests", async () => {
+    const fetchMock = vi.fn().mockResolvedValue(
+      new Response(JSON.stringify({ ok: true }), {
+        status: 200,
+        headers: { "Content-Type": "application/json" }
+      })
+    );
+    vi.stubGlobal("fetch", fetchMock);
+
+    await api.deleteLibrary(42);
+
+    const init = fetchMock.mock.calls[0][1] as RequestInit;
+    const headers = new Headers(init.headers);
+    expect(init.method).toBe("DELETE");
+    expect(headers.has("Content-Type")).toBe(false);
+  });
 });
diff --git a/apps/web/src/api/client.ts b/apps/web/src/api/client.ts
index c0f9e21..44298ef 100644
--- a/apps/web/src/api/client.ts
+++ b/apps/web/src/api/client.ts
@@ -56,15 +56,20 @@ function apiErrorMessage(detail: string, fallback: string): string {
   return fallback;
 }
 
+function requestHeaders(options: RequestOptions): Headers {
+  const headers = new Headers(options.headers);
+  if (options.body !== undefined && !headers.has("Content-Type")) {
+    headers.set("Content-Type", "application/json");
+  }
+  return headers;
+}
+
 async function request<T>(path: string, options: RequestOptions = {}): Promise<T> {
   try {
     const response = await fetch(`${API_BASE}${path}`, {
       ...options,
       credentials: "include",
-      headers: {
-        "Content-Type": "application/json",
-        ...options.headers
-      }
+      headers: requestHeaders(options)
     });
 
     if (!response.ok) {
diff --git a/apps/web/src/pages/AdminPage.tsx b/apps/web/src/pages/AdminPage.tsx
index 0990dc5..2e42aef 100644
--- a/apps/web/src/pages/AdminPage.tsx
+++ b/apps/web/src/pages/AdminPage.tsx
@@ -158,7 +158,7 @@ export function AdminPage() {
           <div className="library-table">
             {libraries.map((library) => (
               <div key={library.id}>
-                <div>
+                <div className="library-copy">
                   <strong>{library.name}</strong>
                   <span>Chemin : {library.path}</span>
                 </div>
diff --git a/apps/web/src/styles/app.css b/apps/web/src/styles/app.css
index fc48d90..4f921ea 100644
--- a/apps/web/src/styles/app.css
+++ b/apps/web/src/styles/app.css
@@ -284,6 +284,26 @@ h2 {
   align-items: center;
 }
 
+.library-copy {
+  display: grid;
+  gap: 7px;
+  min-width: 0;
+}
+
+.library-copy strong,
+.library-copy span {
+  display: block;
+}
+
+.library-copy strong {
+  overflow-wrap: anywhere;
+}
+
+.library-copy span {
+  color: var(--ink-muted);
+  overflow-wrap: anywhere;
+}
+
 .meter {
   display: block;
   width: 100%;