A search that ignores what a thing is called is no search, so the name wins (#43)

Typing "variable" into the node palette landed on `Run behavior`, because the
filter weighed label, type and description alike and then sorted by category.
`searchRank` in `src/ui/search.ts` now ranks a match: exact label or type, then
prefix, then label, then type, and only last a hit that lives in the
description alone. Category and alphabet order within a rank. The searchable
`Menu` uses the same function, so searching means the same thing everywhere.

The `+` menu grew to fifteen entries in declaration order. It is built in two
alphabetical groups now -- the types that go into a scene, then the ones that
stay in the library -- with a separator between them, the split `isPlaceableType`
already draws. `ASSET_TYPES` itself stays untouched: it is also the
serialisation and check order. A search flattens the groups and drops the lines.

Popups were capped at fixed heights (320 menu, 260 palette, 340 pickers) while
the canvas had room to spare. `Popup.roomFor()` measures its own chrome and
takes the window height minus a tenth at each end. Placement clamps
asymmetrically: the bottom margin is enforced, the top is only a budget, so a
menu anchored near the top stays at its button instead of being pushed off it.

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

tools/e2e/lib/scaffold.mjs

@@ -132,10 +132,11 @@ export async function openTab(t, tab) {
 }
 
 /**
- * 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.
+ * Picks an asset type from the already-open `+` menu. Since #43 the menu may grow to the height of
+ * the canvas, so on this window every type is usually on screen at once; the scroll stays in as
+ * insurance for a shorter window, where entries below the mask edge are still found by `locate`
+ * but a click there lands on nothing. That is what the fourteenth type (`Variables`, #91) did to
+ * `Font` and to step 30.
  */
 export async function pickAssetType(t, label) {
   const box = await t.json('__gm.overlayRect()');