Vacuum: deselect what is blown out, Ctrl + wheel scrolls the bag, Ctrl+click fix (t20)

Blowing out the last of a selected material removes it from the selection,
so an emptied selection picks up what you click again. Ctrl + wheel never
zooms the page and scrolls the bag list under the mouse. A bag click while
Ctrl is held adds to the selection even if the click lacks the Ctrl flag.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/actions.js

@@ -222,6 +222,8 @@ function toolTick() {
       const list = GAME.blowAll ? blowAllList() : blowList();
       if (!GAME.blowAll && !list.length) { setStatus('None of the selected materials are in the bag.'); return; }
       const r = GAME.blowAll && !list.length ? { placed: 0, status: 'Nothing loose in the bag to blow.' } : toolBlow(ax, ay, GAME.brush[1], list[0] || 0, list.length > 1 ? list : null);
+      // blown down to nothing: it leaves the selection, so an empty selection picks up what you click again
+      for (const m of list) if (bag[m] <= 0 && GAME.blow.delete(m)) { lastBagKey = ''; hudDirty = true; }
       if (r.placed) { playSfx('blow'); hudDirty = true; } else if (r.status) setStatus(r.status);
     } else if (t === 'build') {
       const key = `${(ax / BS) | 0},${(ay / BS) | 0}`;