feat(models): the lounge furniture and the desk books and mugs from blender

[Shironex]

Merge #185 first. This branch is stacked on it, so until #185 lands this PR also shows its four kitchen and plants commits (f8fd1bd, 88fcaa4, 5894841, 6ce0171). Once #185 is squash-merged I'll rebase this onto main, and only the commits below remain.

The lounge's couch, its pillows, the two poufs and the coffee table, and the books and mugs on the desks, modelled in Blender with the kit from #177. Every piece is its own object in its model file and is placed on its own, so a future office editor could move any of them around instead of the lounge being one big asset.

What you get

• A real couch. A blue three-seater with seat and back cushions, rolled arms and little wooden feet, facing the TV where the old one stood. You still sit at the same three places.
• Throw pillows (red and yellow) leaning on the back cushions. They sit between the places now, so nobody sitting down goes through one, as they did with the old boxes.
• Two floor poufs (green and yellow) with piping and a button on top, where the squashed spheres were, with the same seats turned to the TV.
• A round coffee table on a pedestal, the same size, its top still at 0.46 where the Halloween pumpkin stands.
• Desk books in three arrangements that take turns on the desks with books: upright, one leaning on the others, and a stack lying flat. They're hardbacks with page edges and labelled spines.
• A proper mug with a handle and coffee in it, in its desk's chair colour.
• Which desk gets a mug, a plant or books hasn't changed, so the holiday gifts still go in the corner that's left free, and the laptop still has its spot.

How

• blender/scripts/build_lounge.py writes src/client/models/lounge.glb: sofa, pillow, pouf, coffee_table. Each piece's origin is on the floor under its middle, facing +z. Its wood and frame materials use the same names as the desk furniture still to come, so they'll share a palette.
• blender/scripts/build_desk_props.py writes src/client/models/desk_props.glb: mug, books_upright, books_leaning, books_stack.
• world/models.ts: piece(model, part, paint) hands out a painted copy of one named object of a preload model, or an empty group if the model didn't load. The plants, the lounge and the desks all use it.
• world/office.ts:
  • loungeCouch(), pouf(), coffeeTable(), deskMug() and deskBooks() build the pieces. The pillows hang under the couch, so a click on one still offers the couch.
  • Positions, seat ids and footprints stay as they were.
  • The couch's collider top goes from 0.55 to 0.47 and the poufs' from 0.6 to 0.42, the tops of their cushions, so you stand on them instead of floating above. Both are still above the step height, so you still jump up onto them.
• tests/player.test.ts has its copies of those two colliders updated.
• lab/props.ts: show=lounge, and show=desk_props (desks=1 puts them on real desks).
• tests/lounge-model.test.ts, tests/desk-props-model.test.ts: piece and material names, sizes, seat and table heights, footprints clear of the laptop and the holiday spot, and triangle budgets.
• Cost:
  • Lounge: sofa about 3k triangles, pillow about 0.7k, pouf about 1.5k, table about 1k.
  • Desks: about 0.3k triangles per piece. Draw calls go from about 21 to about 32 across 16 desks.

Checked

• npm run typecheck and npm run build:client.
• Tests on Windows: every file passes apart from the ones that fail the same way on a clean main there (workers.test.ts hangs, repos.test.ts fails two tests and then hangs, and one meetings.test.ts case expects / paths). Not run on macOS or Linux.
• The props lab for both models.
• The whole office built in the lab, with people sitting at all three couch places and on both poufs.

Follow-up

• The poufs could squash down when someone sits on them, if we want that.