WARNING: This mod is new and currently being tested. Please report any bugs or issues!

• Ctrl+Alt+T toggles a private test surface (pocket dimension) for each player
• When you enter, your inventory is saved and you get infinite resources, cheat mode, all recipes unlocked, and test items (infinity chests, infinity pipes, loaders)
• The test surface is a flat refined-concrete plane with always day, no enemies, and no cliffs
• Space-related buildings (rocket silo, cargo landing pad) are blocked in the test zone to prevent leaving via space travel
• When you press Ctrl+Alt+T again to leave, your original inventory, position, surface, and force are restored
• If you disconnect while in the test zone, it automatically exits you back to your original location
• Each player gets their own separate test surface — multiplayer compatible

Release Info:
1.0.0 - Initial release. Ctrl+Alt+T to enter/exit private test zone with infinite resources and all recipes.
1.0.2 - Fixed export_stack() crash on non-exportable items by wrapping in pcall.
1.0.3 - Added spawn buttons at top of screen for infinity chests, pipes, and loaders (SpeedControl-style).
1.0.4 - Changed spawn buttons to use item icons with hover tooltips instead of text labels.
1.0.5 - Test zone inventory now saved and restored between visits.
1.0.6 - Default items only given on first entry; use buttons for more after that.
1.0.7 - Fixed cheat mode not re-enabling on subsequent test zone entries.
1.0.8 - Added quickbar save/restore per dimension.
1.0.9 - Fixed export_stack/import_stack calling convention for blueprint preservation.
1.1.0 - Replaced export/import serialization with physical chest storage using swap_stack to preserve all item metadata.
1.1.1 - Added guns and ammo inventory saving per zone.
1.1.2 - Increased storage chest size to 1000 slots.
1.1.3 - Moved storage chests to a hidden pd-storage-vault surface so players never see them.
1.1.4 - Deferred quickbar restore to next tick to avoid state timing issues.
1.1.5 - Removed quickbar manipulation entirely to stop breaking toolbar references.
1.2.0 - Major rewrite: character swapping instead of inventory swapping. Each dimension has its own persistent character entity - items never move, preserving all metadata.
1.2.1 - Added per-dimension quickbar save/restore that re-links slots to specific LuaItemStack references in the current character's inventory.
1.2.2 - Cleaned up unused pd-storage-chest entity definition.
1.2.3 - Added 10x robot speed modifier in test zone.