Add project documentation

docs/dashboard-ui.md

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+# Dashboard User Interface
+
+## Dashboard Screen
+
+Displays:
+- Battery %
+- Runtime Remaining
+- Fridge Zone 1 Temperature
+- Fridge Zone 2 Temperature
+- Rear Seat Temperature
+- Outside Temperature
+- Starlink Status
+- Fridge Status
+
+## Battery Screen
+
+Displays:
+- SOC
+- Voltage
+- Current
+- Remaining Ah
+- Runtime Estimate
+- Battery Temperature
+
+Future:
+- Cell Voltages
+- Cell Imbalance
+- Charge Cycles
+
+## Temperature Screen
+
+Displays:
+- Fridge Zone 1
+- Fridge Zone 2
+- Rear Seat
+- Outside Air
+
+Future:
+- Battery Bay
+- Cabin Air
+
+## Power Screen
+
+Controls:
+- Starlink
+- Fridge
+
+Future:
+- Inverter
+- Camp Lights
+
+## System Screen
+
+Displays:
+- RS-485 Status
+- WiFi Status
+- Message Counts
+- Latency
+- Packet Loss
+
+Testing:
+- RS-485 Disconnect
+- Sensor Fault Simulation
+- Ignition Simulation
+
+## Config Screen
+
+Configuration:
+- Alarm Thresholds
+- Audible Alarm Settings
+
+Future:
+- WiFi Settings
+- Device Naming
+- Firmware Information