fix(GRO-564): wrap admin nav links in scrollable div to prevent logout overflow

- Add flexShrink:0 to logo div to prevent shrinking
- Wrap Book + NAV_LINKS in scrollable div with overflow-x:auto, flex:1, minWidth:0
- Add flexShrink:0 to all nav links
- Move logout button outside scrollable div with flexShrink:0 instead of marginLeft:auto
- Keeps logout button always visible regardless of nav item count

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/src/App.tsx

@@ -210,6 +210,7 @@ function AdminLayout() {
           alignItems: "center",
           gap: 8,
           marginRight: "1.25rem",
+          flexShrink: 0,
         }}>
           {logoSrc && (
             <img src={logoSrc} alt="" style={{ width: 24, height: 24, objectFit: "contain" }} />
@@ -223,6 +224,13 @@ function AdminLayout() {
           </strong>
         </div>
         <GlobalSearch />
+        <div style={{
+          display: "flex",
+          overflowX: "auto",
+          flex: 1,
+          minWidth: 0,
+          gap: "0.25rem",
+        }}>
           <Link
             to="/admin/book"
             style={{
@@ -233,8 +241,8 @@ function AdminLayout() {
               fontWeight: 600,
               color: "#fff",
               background: branding.primaryColor,
-            marginRight: "0.5rem",
               boxShadow: "0 1px 2px rgba(79, 138, 111, 0.3)",
+              flexShrink: 0,
             }}
           >
             Book
@@ -256,19 +264,21 @@ function AdminLayout() {
                   fontWeight: active ? 600 : 500,
                   color: active ? "#2d6a4f" : "#4b5563",
                   background: active ? "#ecfdf5" : "transparent",
+                  flexShrink: 0,
                 }}
               >
                 {label}
               </Link>
             );
           })}
+        </div>
         <button
           onClick={async () => {
             await signOut();
             navigate("/login");
           }}
           style={{
-            marginLeft: "auto",
+            flexShrink: 0,
             padding: "0.4rem 0.85rem",
             borderRadius: 6,
             border: "1px solid #e2e8f0",