Sources sheet: graphical Compare tab, more metrics, tab-inline live dots

UI refactor on the data-sources bottom sheet:
- Drop the standalone "Live data sources" pill row above the tabs. Each
  tab label now carries its own live/offline dot (filled coloured circle
  vs hollow grey ring) so source state reads inline with the tab name.
- Compare tab redesign: two side-by-side picker chip rows joined by a
  centered "VS" badge. No more "Pick two sources" / "A" / "B" labels.
- Comparisons are now graphical line charts of a rolling 30-second time
  series per metric, per source. Both lines share an auto-fitted Y axis;
  the panel header carries the current Δ as a numeric badge so the value
  stays glanceable.
- New comparison metrics: heading (deg), vertical speed (m/s),
  |G| horizontal. Phone tab now also shows heading from Location.bearing
  when speed > 0; satellites count + ±accuracy line for any source that
  reports them.

RaceBox parser additions (both standard 0x01/0x07 and extended 0xFF/0x01
frames):
- Heading of motion from offset 64 (int32 deg * 1e-5, wrapped to 0..360).
- Vertical speed derived from NED velD at offset 56 (mm/s, +down -> +up).
- Number of satellites from offset 23.
ExternalGpsSample + SourceSnapshot gain matching nullable fields.

Version bump for branch testing: 0.6.4-ex_gps (versionCode 43), so test
builds are obvious vs the production 0.6.3 build on main.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: eried

app/build.gradle.kts

@@ -27,8 +27,8 @@ android {
         applicationId = "com.eried.eucplanet"
         minSdk = 29
         targetSdk = 35
-        versionCode = 42
-        versionName = "0.6.3"
+        versionCode = 43
+        versionName = "0.6.4-ex_gps"
 
         val buildStamp = SimpleDateFormat("yyMMdd.HHmm")
             .apply { timeZone = TimeZone.getTimeZone("UTC") }

app/src/main/java/com/eried/eucplanet/ble/gps/RaceBoxAdapter.kt

@@ -101,11 +101,17 @@ class RaceBoxAdapter @Inject constructor() : ExternalGpsAdapter {
         // are useful as a position sample. Drop and let the next frame land.
         if (fixType != 2 && fixType != 3 && fixType != 4) return null
 
+        val numSV = frame[payloadStart + 23].toInt() and 0xFF
         val lonRaw = readInt32LE(frame, payloadStart + 24)
         val latRaw = readInt32LE(frame, payloadStart + 28)
         val hMslRaw = readInt32LE(frame, payloadStart + 36)
         val hAccRaw = readUInt32LE(frame, payloadStart + 40)
+        // NED vertical velocity, positive = down. Flip sign so the field
+        // reads "+up" consistent with phone Location.verticalAccuracyMeters
+        // semantics elsewhere.
+        val velDRaw = readInt32LE(frame, payloadStart + 56)
         val gSpeedRaw = readInt32LE(frame, payloadStart + 60)
+        val headMotRaw = readInt32LE(frame, payloadStart + 64)
 
         val speedMmS = gSpeedRaw.coerceAtLeast(0)
         return ExternalGpsSample(
@@ -114,7 +120,14 @@ class RaceBoxAdapter @Inject constructor() : ExternalGpsAdapter {
             latitude = latRaw * 1e-7,                     // deg
             longitude = lonRaw * 1e-7,                    // deg
             altitudeMeters = hMslRaw / 1000f,             // mm → m
-            accuracyMeters = hAccRaw / 1000f              // mm → m
+            accuracyMeters = hAccRaw / 1000f,             // mm → m
+            headingDeg = (headMotRaw * 1e-5f).let { h ->
+                // Wrap to [0, 360); the wire format can carry small negative
+                // values when heading dithers near zero.
+                ((h % 360f) + 360f) % 360f
+            },
+            verticalSpeedMps = -velDRaw / 1000f,          // mm/s down → m/s up
+            numSatellites = numSV
         )
     }
 
@@ -135,14 +148,17 @@ class RaceBoxAdapter @Inject constructor() : ExternalGpsAdapter {
         val fixType = frame[payloadStart + 20].toInt() and 0xFF
         if (fixType != 2 && fixType != 3 && fixType != 4) return null
 
+        val numSV = frame[payloadStart + 23].toInt() and 0xFF
         val lonRaw = readInt32LE(frame, payloadStart + 24)
         val latRaw = readInt32LE(frame, payloadStart + 28)
         val hMslRaw = readInt32LE(frame, payloadStart + 36)
         val hAccRaw = readUInt32LE(frame, payloadStart + 40)
+        val velDRaw = readInt32LE(frame, payloadStart + 56)
         // Note: in the extended frame the speed field sits at offset 60 too,
         // same as standard PVT — RaceBox kept the layout compatible for the
         // shared fields.
         val gSpeedRaw = readInt32LE(frame, payloadStart + 60)
+        val headMotRaw = readInt32LE(frame, payloadStart + 64)
 
         // Accel: int16 LE milligees on each axis (positive Y = forward).
         // Divide by 1000 to get g.
@@ -160,7 +176,12 @@ class RaceBoxAdapter @Inject constructor() : ExternalGpsAdapter {
             accuracyMeters = hAccRaw / 1000f,
             accelXG = ax,
             accelYG = ay,
-            accelZG = az
+            accelZG = az,
+            headingDeg = (headMotRaw * 1e-5f).let { h ->
+                ((h % 360f) + 360f) % 360f
+            },
+            verticalSpeedMps = -velDRaw / 1000f,
+            numSatellites = numSV
         )
     }
 

app/src/main/java/com/eried/eucplanet/data/model/ExternalGpsSample.kt

@@ -21,6 +21,16 @@ data class ExternalGpsSample(
     val accelXG: Float? = null,
     val accelYG: Float? = null,
     val accelZG: Float? = null,
+    /** Heading of motion in degrees [0..360), or null if unknown. Both
+     *  standard NAV-PVT and the extended frame report this at offset 64
+     *  as int32 deg × 1e-5. */
+    val headingDeg: Float? = null,
+    /** Vertical speed in m/s (positive up), or null if unknown. Derived
+     *  from the NED down-velocity (offset 56, int32 mm/s, +down → flip). */
+    val verticalSpeedMps: Float? = null,
+    /** Number of satellites used in the fix, or null if unknown. Useful as
+     *  a per-source quality indicator. */
+    val numSatellites: Int? = null,
     val timestamp: Long = System.currentTimeMillis()
 )
 

app/src/main/java/com/eried/eucplanet/ui/dashboard/sources/DataSource.kt

@@ -45,7 +45,16 @@ data class SourceSnapshot(
     /** Accel in g, axes aligned to the source's reference frame. */
     val accelXG: Float? = null,
     val accelYG: Float? = null,
-    val accelZG: Float? = null
+    val accelZG: Float? = null,
+    /** Heading of motion in degrees [0..360), or null. Phone source fills
+     *  this in from [android.location.Location.getBearing] when speed > 0. */
+    val headingDeg: Float? = null,
+    /** Vertical speed in m/s (+up), or null. */
+    val verticalSpeedMps: Float? = null,
+    /** GPS quality indicator — only filled for sources with a GPS receiver. */
+    val numSatellites: Int? = null,
+    /** Horizontal positional accuracy in metres, or null. */
+    val accuracyMeters: Float? = null
 ) {
     /** Magnitude of horizontal G-force, useful as a single safety number. */
     val horizGMagnitude: Float?