The two-button revision is complete and verified:
- Rotary encoder removed.
- Rear-left SW3 = Previous, connected to Feather GPIO26.
- Rear-right SW4 = Next, connected to Feather GPIO25.
- Both 12mm tactile buttons are mounted on the PCB bottom/rear side.
- Power switch and corrected portrait 1×9 display header remain.
- Board is fully routed with 0 airwires and no open ERC/DRC warnings or errors.
The battery is an enclosure-mounted item, not PCB-mounted. Next, the firmware and enclosure should be finalized around the rear buttons and 61.9 × 33.3 × 3.2mm battery.