firmware: expand sensor telemetry

firmware/xiao-esp32c6-sensor-node/sensor_state.h

@@ -1,12 +1,22 @@
 #pragma once
 #include <Arduino.h>
 
+struct Vector3State {
+    float x = 0, y = 0, z = 0;
+    uint8_t accuracy = 0;
+    unsigned long lastUpdateMs = 0;
+};
+
 struct ImuState {
     bool online = false, valid = false;
     uint8_t accuracy = 0;
     float i = 0, j = 0, k = 0, real = 1;
     float yawDegrees = 0, pitchDegrees = 0, rollDegrees = 0;
     unsigned long lastUpdateMs = 0;
+    Vector3State linearAcceleration, angularVelocity, gravity;
+    uint8_t stabilityCode = 0;
+    String stability = "unknown";
+    unsigned long stabilityLastUpdateMs = 0;
 };
 
 struct GpsState {
@@ -20,5 +30,8 @@ struct GpsState {
     uint32_t sentencesPassed = 0;
     uint32_t sentencesFailed = 0;
     uint32_t baud = 0;
+    bool hdopValid = false;
+    double hdop = 0;
+    unsigned long locationAgeMs = ULONG_MAX, timeAgeMs = ULONG_MAX;
     unsigned long lastByteMs = 0;
 };