Rebuild and Improve 3D Print Files for Case and Front Plate

### Description
The existing 3D print files for the enclosure and front plate require revision. The current design needs structural improvements and a more reliable mechanism for holding push buttons.

This issue focuses on redesigning or improving the mechanical components to achieve a more robust and practical construction.

### Tasks
- Review and rebuild the current 3D case design if necessary
- Improve the front plate layout and mounting structure
- Optimize internal spacing for PCB, switches, and wiring
- Redesign the push button holding mechanism
- Develop a new, more robust button mounting system
- Ensure reliable alignment between buttons, front plate, and PCB

### Design Goals
- Increased structural stability
- Improved durability for repeated button usage
- Easier assembly and maintenance
- Proper alignment of all mechanical components

### Deliverables
- Updated or rebuilt 3D design files
- Printable STL files
- Optional editable source files (e.g. CAD format)
- Verified fit with the current PCB and components

Start by reviewing the current 3D case and front-plate files, then compare their spacing and alignment with the current PCB, switches, wiring, and buttons. Done means updated printable STL files with a stable enclosure, reliable button mounting, proper component alignment, and easier assembly.

Written by the indexing model from the issue text.