Rename screw tubes to screw conveyors (t44)

Player text says Screw conveyor; code uses screw (BP_SCREW, piece id
screw, screwIntake...). No compatibility code for old saves or
blueprints. Suite outputs match before and after apart from names.

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

src/sim/progress.js

@@ -30,14 +30,14 @@ const MILESTONES = [
   { id: 'copper', title: 'Molten copper', msg: 'Molten copper sinks to the bottom of the charge. Get it into a mold before it sets.', hint: 'Copper ore melts at 1085°C. An open fire loses too much heat, so wall coal and ore in with blocks and leave a small vent at the top for smoke. Mix ore and coal about half and half: Ctrl+click coal and copper ore in the bag to blow a mix. Right click blows an even mix.' },
   { id: 'bars', title: 'Copper bars', msg: 'Bars sell for far more than the ore in them, and make metal wall blocks.', hint: 'Build an Ingot mold (Build, 3) right under the furnace with a floor of clay Grates between them: molten copper drips through, while the charge and the thick slag stay up. When the bars set, they drop out of the bottom of the mold onto whatever is under it; a belt carries them off. Leave space below, or pick up the bars with the Pneumatic nozzle. Ingot molds empty themselves: bars, junk and scrap drop below, slag is thrown away and the grate above is raked. Removing any mold returns its set metal to your bag: whole bars as bars, the rest as scrap. Copper that sets in the furnace melts again next firing.' },
   { id: 'bit1', title: 'Copper drill bit', hint: 'Cast copper in a Bit mold. Building the furnace right on top works. A Grate over the funnel keeps the charge out. Let it set, then press F.', reward: 'Copper bit. You can now dig iron ore.' },
-  { id: 'auto', title: 'Moving parts', msg: 'Machines can now haul for you. Feed furnaces automatically, and lift ore out of your mines.', hint: 'Belts carry grains and bars resting on them. Screw tubes push loose material along (never liquids); stacked pointing up they lift it out of a mine. A Filter lets one material fall through and carries the rest along, so you can sort ore from rubble. Move 300 grains with machines.' },
+  { id: 'auto', title: 'Moving parts', msg: 'Machines can now haul for you. Feed furnaces automatically, and lift ore out of your mines.', hint: 'Belts carry grains and bars resting on them. Screw conveyors push loose material along (never liquids); stacked pointing up they lift it out of a mine. A Filter lets one material fall through and carries the rest along, so you can sort ore from rubble. Move 300 grains with machines.' },
   { id: 'glass', title: 'Glass', hint: 'Sand melts near 1300°C. Still air will not get a fire that hot: point a Fan into the fuel. Molten glass runs through a grate like metal, so cast it in an Ingot mold for glass bricks, which sell well.', reward: 'Flask unlocked. The nozzle can suck up and blow out liquids.' },
   { id: 'iron', title: 'Molten iron', msg: 'Iron is hard to keep molten. A brick mold right under the hot zone works best.', hint: 'Iron ore melts at 1538°C. That needs forced air, and stone slumps at 1250°C, so build the furnace from brick.' },
   { id: 'bit2', title: 'Iron drill bit', hint: 'Cast iron in a Bit mold. A stone mold melts at iron temperatures, so build it from brick.', reward: 'Iron bit. Granite is now diggable.' },
   { id: 'steel', title: 'Steel', msg: 'Cast it in a brick Bit mold for the best drill bit there is.', hint: 'Blow air through molten iron. Aim a Fan at a pool of it and the excess carbon burns off, turning it into steel.' },
   { id: 'bit3', title: 'Steel drill bit', hint: 'Cast steel in a brick Bit mold.', reward: 'Steel bit. Basalt is now diggable.' },
   { id: 'tank', title: 'Bigger bag', hint: 'Cast any metal in a Tank mold and knock it out to carry more.' },
-  { id: 'sale', title: 'First sale', msg: 'Money buys machines: belts, screw tubes and fans. Refined goods pay far more than raw.', hint: 'Blow, belt or lift goods into the trade dock near where you started. They are paid for the moment they drop through the grate in its floor.' },
+  { id: 'sale', title: 'First sale', msg: 'Money buys machines: belts, screw conveyors and fans. Refined goods pay far more than raw.', hint: 'Blow, belt or lift goods into the trade dock near where you started. They are paid for the moment they drop through the grate in its floor.' },
   { id: 'order', title: 'First order filled', msg: 'Bigger buyers notice you as you fill more orders.', hint: 'Buyers post orders on the Market page: an amount of one good by a deadline, at well over market price. Goods dropped into the dock fill an open order first.' },
   { id: 'alloy', title: 'An alloy', msg: 'Alloys sell for far more than the metals that went into them.', hint: 'Tin ore lies a little deeper than copper, zinc deeper again. Melt tin into a pool of molten copper and it mixes into bronze; zinc makes brass.' },
   { id: 'precious', title: 'Precious metal', hint: 'Silver lies deep in the granite, gold deeper still. Their ore sells high even raw, and much higher as bars.' },