reduce spacing between buttons to fix toolbar not fitting on a single line on mobile

commafeed-client/src/components/ButtonToolbar.tsx

@@ -0,0 +1,5 @@
+import { Group } from "@mantine/core"
+
+export function ButtonToolbar(props: { children: React.ReactNode }) {
+    return <Group spacing={14}>{props.children}</Group>
+}