Description

Add a comprehensive device configuration editor with tabbed UI for all Meshtastic config categories.

Requirements

• Create DeviceConfigView.swift — tabbed config editor (Device, Position, LoRa, Bluetooth, Network, Display, Power, MQTT)
• Add admin message request handlers for each config type in protocol service
• Add config response handlers to populate UI (receivedConfigs, receivedModuleConfigs)
• Add save handlers to write config back to device (wrapped in beginEditSettings/commitEditSettings)
• Add requestDeviceConfig() and saveDeviceConfig() to AppCoordinator
• Add Device Config toolbar button in MainView
• Session key management (reuse existing ensureSessionKey())