api/gaufre: make sure the popup is shown in the viewport

small test that anchors the popup to the left of the viewport, this
quickly fixes the popup going out of viewport if the Gaufre button is
used on the left of a header bar

packages/integration/src/dev/dev.tsx

@@ -150,7 +150,11 @@ const routes = [
           }}
         >
           <div style={{ display: "flex", justifyContent: "space-between" }}>
-            <h1>Test de la Gaufre</h1>
+            <h1>À droite</h1>
+            <Gaufre />
+          </div>
+          <div style={{ display: "flex" }}>
+            <h1>À gauche</h1>
             <Gaufre />
           </div>
           <p>