The + menu holds fourteen types now, so scrolling one into view belongs to the scaffold (#91)

`Variables` pushed `Font` under the menu's mask edge: `locate` still finds the entry, a click there
lands on nothing, `__gm.fontPicker()` is null and reading `.captions` throws. Only step 31 carried
the scroll workaround, so step 30 fell. The helper moves to `lib/scaffold.mjs` as `pickAssetType()`
and both steps use it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tools/e2e/lib/scaffold.mjs

@@ -129,3 +129,24 @@ export async function openTab(t, tab) {
   await t.clickText(TAB_LABELS[tab]);
   await t.sleep(400);
 }
+
+/**
+ * Picks an asset type from the already-open `+` menu. The menu has one entry per type and scrolls
+ * past 320 px, so the last of them sit under the mask: `locate` still finds them, but a click there
+ * lands on nothing. The fourteenth type (`Variables`, #91) pushed `Font` under that edge and took
+ * step 30 down with it, because only step 31 had scrolled first.
+ */
+export async function pickAssetType(t, label) {
+  const box = await t.json('__gm.overlayRect()');
+  let p = await t.locate(label, true);
+  let scrolled = false;
+  if (box && (!p || p.y > box.y + box.h - 4)) {
+    await t.wheel(box.x + box.w / 2, box.y + box.h / 2, 300);
+    await t.sleep(250);
+    p = await t.locate(label, true);
+    scrolled = true;
+  }
+  await t.click(p.x, p.y);
+  await t.sleep(250);
+  return { box, p, scrolled };
+}