Build 25298954

Building & placement
- ★ Buildings that need a foundation pad on sloped ground now show the pad in the preview, and placement is refused if the pad would cut into a neighbouring building (batteries no longer "grow a floor" into solar panels).
- Floors can no longer be built into an existing floor. Edge-to-edge tiling and stacking a floor on top of another still work.
- The Player Crate's delete-tab button now reads "Remove" and has a tooltip (it used to be a blank red button).

Transport drones
- Drones no longer over-deliver: a requester's shortfall now accounts for drones already on their way, so you won't see two or three times the requested amount arrive and bounce into storage.
- Items in your Dispose grid now send exactly one pickup drone instead of a new drone every couple of seconds.
- Buffer chests now work as described: they stage the items you filter for, take overflow only of those items, and hand out their surplus to the network.
- The Drone Carry Capacity research now actually increases how much a drone carries per trip. Previously it had no effect.
- Drones returning to a full Drone Port no longer vanish; the drone is dropped beside the port instead.
- Requester and Buffer chests no longer request items that physically cannot fit, which was sending drones on endless wasted trips.
- Requester slot filters are no longer lost when loading a save.
- Newly researched items now appear in the drone Request chooser without reloading.
- Launches are spread across ports with available drones instead of being dropped when one port runs dry, and requesters are served in rotation so none starve.
- New "Transport Drones" topic in the Help menu explaining ports, chest modes, and the Request/Dispose grids.

Companions & creatures
- ★ Companions moved into a Creature Nest no longer drop to level 1, and new creatures no longer show a borrowed level. Level and XP are now shared per species.
- ★ Nest guards no longer run in place against walls; they pick reachable patrol points and recover if stuck.

Teleport
- ★ Arriving at a teleport stone now places you in front of it instead of inside its mesh.

Items
- ★ Berraflux is now a solid ore with a stack size of 100 (it could previously pile 2400 into one container slot), and Chemical Plant recipes take it through normal input slots.