Improved item inspection and attachment handling

I separated carrying an item from inspecting it. Left-click keeps the inventory drag action; right-click opens inspection for backpack, equipped and already-held items without moving them or spending time units.

Rifle attachments now sit in two horizontal wells below the inspected weapon. Installed pictures and empty slots use the new tray, with explicit mounting, removal and a flashlight switch. The attachment identity and saved light state survive removal, remounting and reload.

“Right-click inspects equipped, backpack and held items; a horizontal tray holds two rifle attachments.”

Use and Disassemble remain explicit actions. Hotbar reload and light controls also open where the pointer is, making those small decisions easier to reach.