- Add battery icon with percentage display on main screen
- Implement battery voltage reading via ADC pin 4
- Remove network ID from main display to reduce clutter
- Reorganize UI layout for better space utilization:
* Move battery icon to prevent text overflow
* Compact header to single device info line
* Gain 10 pixels vertical space for device list
- Battery updates every 30 seconds to conserve power
- Network ID still visible on 2-second startup screen
BREAKING CHANGE: Replace separate anchor/tag firmware with single configurable codebase
## Major Changes
- **Unified Firmware**: Single main.cpp replaces main_anchor.cpp and main_tag.cpp
- **Modular Config**: Organized configuration system in src/config/ directory
- **Dynamic Behavior**: Device behavior determined by build flags at compile time
- **Simplified Builds**: Reduced from 8+ environments to 3 core environments
## New Architecture
- src/main.cpp - Single firmware with config-driven behavior
- src/config/device_config.h - Device role detection and unified behavior
- src/config/anchor_config.h - Anchor-specific settings (positioning, communication)
- src/config/tag_config.h - Tag-specific settings (USB streaming, coordinate collection)
- src/config/positioning_config.h - Distributed positioning algorithm framework
## Build System Improvements
- Simplified platformio.ini (anchor/tag/debug environments)
- Support for custom device ID and network via PLATFORMIO_BUILD_FLAGS
- Same firmware for all devices, behavior configured at compile time
- Easy device configuration: set PLATFORMIO_BUILD_FLAGS=-DUWB_INDEX=5 -DNETWORK_ID=2000
## Technical Benefits
- Reduced code duplication from ~350 lines to unified ~200 lines
- Consistent behavior across device types
- Easier maintenance with single codebase
- Framework ready for distributed positioning algorithm implementation
- Modular configuration system for future algorithm expansion
## Positioning Framework Ready
- Anchor discovery protocol framework established
- Inter-anchor communication configuration ready
- Position calculation algorithm structure in place
- Coordinate storage and validation system configured
- Tag coordinate collection and USB streaming framework prepared
## Testing
- ✅ Anchor build successful (325KB flash usage)
- ✅ Tag build successful (325KB flash usage)
- ✅ Custom device ID/network configuration working
- ✅ UWB initialization sequence fixed for active networks
