LMF5000/battery-pack-architect ? reverse-engineered prompt

Build me a browser based battery pack planner for cylindrical cells.

I want to be able to enter a cell type or pick from a built in list, then lay out a pack in series and parallel, change the spacing, and switch between a hex style layout and a more rectangular one. It should show the pack in 3D so I can rotate, pan, and zoom around it, and the model should update as I change the settings.

Please also add basic simulation numbers that feel useful for real world pack building, like total voltage, capacity, estimated voltage sag under load, efficiency, output power, heat from the cells and nickel strips, plus weight and size estimates. If possible, let me compare a few different builds side by side and save and load my setups locally. It would be great if I could export the finished geometry too, maybe as STL for printing spacers or using in CAD. Make it responsive so it works well on desktop and phone, and look up current docs online if you need to.