Vacuum: pick up what you click, blow out what's in hand (t20)

A drag takes only the material it starts on (Shift: everything). The blow
selection is the hand: click or Q/E for one material, Ctrl+click for a mix.
Empty materials leave the hand, an empty hand blows nothing, and a pickup
fills an empty hand. Removes the pick-up marks and the F vacuum menu.

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

src/ui/hud.js

@@ -25,16 +25,10 @@ function grainAt(ax, ay) {
 function selectTool(k) {
   if (k === GAME.tool) return;
   GAME.tool = k; GAME.drag = null; hudDirty = true; renderHotbar(); playSfx('ui');
-  if (toolId() === 'vacuum') ensureBlow();
 }
 function bagMaterials() { return BAG_ORDER.filter(m => bag[m] > 0); }
 function blowList() { return [...GAME.blow]; }
 // Shift + right click: an even mix of everything loose in the bag (bars never mix)
 function blowAllList() { return bagMaterials().filter(m => PH[m] !== PH_ITEM && (PH[m] !== PH_LIQUID || player.flask)); }
 function blowingAll() { return toolId() === 'vacuum' && (GAME.rmb ? !GAME.rmbConsumed && GAME.blowAll : modShift()); }
-// Empty materials stay chosen until the player changes the marks.
-function ensureBlow() {
-  if (GAME.blow.size) return;
-  const l = bagMaterials(); if (l.length) GAME.blow.add(l[0]);
-}
 function piece() { return PIECES[GAME.pieceIdx]; }