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/info.js

@@ -118,7 +118,7 @@ function hoverInfo(ax, ay) {
     t2.push(HARD[m] > 6 ? 'cannot be drilled' : ok ? `drillable (hardness ${HARD[m]})` : `too hard (${HARD[m]})`);
     if (!ok && toolId() === 'drill') warn = HARD[m] > 6 ? 'cannot be drilled' : 'too hard';
   }
-  if (!bar && PH[m] === PH_POWDER) t2.push(GAME.collect.has(m) ? 'loose · marked to pick up' : 'loose');
+  if (!bar && PH[m] === PH_POWDER) t2.push('loose');
   if (!bar && m === EMPTY && bgm[i]) { t1 = bgm[i] === WOOD ? 'Tree trunk' : 'Leaves'; t2.unshift(bgm[i] === WOOD ? 'drill it for wood chunks' : 'water and sand pass through'); }
   if (flags[i] & F_BURN) t2.push('burning');
   const mo = moldAt(ax, ay);