fix(FN-1294): make Settings memory editor wrapper a flex container

- Add display: "flex" to the Memory tab editor wrapper in SettingsModal.
- Set flexDirection: "column" so the embedded FileEditor lays out correctly inside the fixed-height container.

packages/dashboard/app/components/SettingsModal.tsx

@@ -1553,6 +1553,8 @@ export function SettingsModal({
                     border: "1px solid var(--border)",
                     borderRadius: "var(--radius)",
                     overflow: "hidden",
+                    display: "flex",
+                    flexDirection: "column",
                   }}
                 >
                   <FileEditor