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>

tasks/t20.md

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+---
+id: t20
+status: Review
+order: 2
+priority: P3
+created: 2026-10-24
+updated: 2026-10-24T17:34:39Z
+title: vacuum/blow tool rethink
+report: |
+  (agent) The Vacuum now picks up what you click and blows out what's in hand. Left drag takes
+  only the material it starts on (or the first loose grain it reaches); Shift takes everything.
+  The hand is what right click blows: click a bag name or Q/E for one material, Ctrl+click to
+  add to a mix, Shift + right click for everything loose. When something in hand runs out it
+  leaves the hand; with nothing in hand, right click blows nothing and says how to choose.
+  Picking something up with an empty hand puts it in hand. The pick-up marks (R,
+  Ctrl+right-click) and the F vacuum menu are gone.
+  To check: drag starting on copper ore in a mixed pile (only ore comes up); empty the hand and
+  pick up coal (coal goes in hand); Ctrl+click coal and copper ore and blow a mix into a furnace
+  until one runs out (the other keeps going); Shift + right click.
+---
+
+# Context
+
+I dont like the current tool. I want to completely rethink how to pick up and drop materials in the game. maybe a vacuum isnt the best tool. maybe it is. I just want to discuss some options for picking up and dropping the materials in the game. it dont need to be super complicated, but i do need to be able to selectively pick up and drop materials. lets brainstorm multiple ideas for tools maybe multiple tools or just one. i want it to be simple and intuitive.
+
+## Subtasks
+
+- [x] discuss with user in claude code when asked about it, to work out exactly what the user wants
+- [x] Pick up what you click: a drag that starts on a material sweeps up only that material, and Shift takes everything
+- [x] One bag item (or a Ctrl+click mix) is in hand; Q/E or clicking a bag row changes it, and right click blows it out
+- [x] When the last of something in hand is blown out, it leaves the hand; an empty hand says so instead of blowing
+- [x] Picking something up with an empty hand puts it in hand
+- [x] Remove the pick-up marks (R, Ctrl+right-click, the "Only marked" chip) and the F vacuum menu