oscilloscope chassis

### Summary
This is a 100% original, bolt-free sliding enclosure designed from scratch for the popular **DIY Simple 500kHz Oscilloscope with STM32** project by Mirko Pavleski (mircemk).

If you want to build the electronics for this scope, you can find the full circuit layout and code here:
https://www.hackster.io/mircemk/diy-simple-500khz-oscilloscope-with-stm32-arduino-ide-a06cd1

I designed this housing to give the project a clean, hardware-free cyberdeck aesthetic. It uses interlocking sliding rails and integrated magnet slots rather than screws or heat-set inserts.

### Design Features:
* **Slide-Lock Rail System:** The front faceplate smoothly glides into integrated tongue-and-groove side tracks on the main chassis body.
* **Engineered Clearances:** Modeled with a 0.15mm to 0.2mm sliding tolerance and 0.4mm internal fillets, ensuring it prints beautifully on standard FDM printers without jamming.
* **Magnetic Latches:** Integrated precise pockets on the inside margins for small