Find the scrolling chip row inside its scroll-button wrapper

Plan step 32. The chip set's scroll buttons (plan step 24) moved
`x-data="materialChipSet"` from the row to a wrapper around the row and
its buttons, so `[data-chip-set][x-data]` found the first wrapping set on
the page, which never overflows.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9

tests/Browser/ChipsTest.php

@@ -158,7 +158,8 @@ it('removes an Alpine input chip with Backspace, focusing the chip before it', f
 });
 
 it('scrolls a chip set sideways, fading the edge it can still scroll towards', function () {
-    $row = "document.querySelector('#chips [data-chip-set][x-data]')";
+    // The scrolling row, inside the component that also holds its scroll buttons.
+    $row = "document.querySelector('#chips [x-data=\"materialChipSet\"] > [data-chip-set]')";
 
     $page = chipShowcase();