feat: elevation profile with distance axis, rename app, add ABI splits

- Show distance (not time) on X-axis for elevation and speed charts
- Rename app from "Bincio" to "Bincio Autarchive"
- Reinstate arm64-v8a and armeabi-v7a ABI splits for separate APK builds
- Add Haversine distance calculation from GPS coordinates

.idea/deviceManager.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DeviceTable">
+    <option name="columnSorters">
+      <list>
+        <ColumnSorterState>
+          <option name="column" value="Name" />
+          <option name="order" value="ASCENDING" />
+        </ColumnSorterState>
+      </list>
+    </option>
+  </component>
+</project>

.idea/markdown.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="MarkdownSettings">
+    <option name="previewPanelProviderInfo">
+      <ProviderInfo name="Compose (experimental)" className="com.intellij.markdown.compose.preview.ComposePanelProvider" />
+    </option>
+  </component>
+</project>

app.json

@@ -1,7 +1,7 @@
 {
   "expo": {
-    "name": "Bincio",
-    "slug": "bincio",
+    "name": "Bincio Autarchive",
+    "slug": "bincio-autarchive",
     "version": "0.1.0",
     "orientation": "portrait",
     "scheme": "bincio",

app/activity/[id].tsx

@@ -21,6 +21,7 @@ type Timeseries = {
   power_w?:     (number | null)[] | null;
   lat?: (number | null)[] | null;
   lon?: (number | null)[] | null;
+  distance_m?:  number[] | null;
 };
 
 // ── Screen ───────────────────────────────────────────────────────────────────
@@ -361,6 +362,10 @@ function MetricCharts({ timeseries, loading, accent }: { timeseries: Timeseries
   const { color, unit, decimals } = TAB_META[tab];
   const raw = seriesMap[tab]!;
 
+  const distances = timeseries.distance_m
+    ? timeseries.distance_m
+    : calculateDistanceFromCoords(timeseries.lat, timeseries.lon);
+
   return (
     <View style={styles.chartContainer}>
       {/* Tab row */}
@@ -378,15 +383,15 @@ function MetricCharts({ timeseries, loading, accent }: { timeseries: Timeseries
         ))}
       </View>
       {/* Chart */}
-      <MetricChart key={tab} times={timeseries.t} values={raw} color={color} unit={unit} decimals={decimals} />
+      <MetricChart key={tab} distances={distances} values={raw} color={color} unit={unit} decimals={decimals} />
     </View>
   );
 }
 
 function MetricChart({
-  times, values, color, unit, decimals,
+  distances, values, color, unit, decimals,
 }: {
-  times: number[];
+  distances: number[] | null;
   values: (number | null)[];
   color: string;
   unit: string;
@@ -396,25 +401,28 @@ function MetricChart({
   const H = 100;
   const PAD = 4;
 
+  if (!distances) return null;
+
   // Downsample to ≤300 points
   const step = Math.max(1, Math.floor(values.length / 300));
-  const ts   = times.filter((_, i) => i % step === 0);
+  const ds   = distances.filter((_, i) => i % step === 0);
   const vs   = values.filter((_, i) => i % step === 0).map(v => v ?? 0);
 
   const minV = Math.min(...vs);
   const maxV = Math.max(...vs);
   const range = maxV - minV || 1;
-  const maxT  = ts[ts.length - 1] || 1;
+  const maxD  = ds[ds.length - 1] || 1;
 
-  const x = (t: number) => PAD + (t / maxT) * (W - PAD * 2);
+  const x = (d: number) => PAD + (d / maxD) * (W - PAD * 2);
   const y = (v: number) => PAD + (1 - (v - minV) / range) * (H - PAD * 2);
 
-  const pts      = ts.map((t, i) => `${x(t).toFixed(1)},${y(vs[i]).toFixed(1)}`);
+  const pts      = ds.map((d, i) => `${x(d).toFixed(1)},${y(vs[i]).toFixed(1)}`);
   const linePath = `M ${pts.join(' L ')}`;
-  const areaPath = `M ${x(ts[0])},${H} L ${pts.join(' L ')} L ${x(maxT)},${H} Z`;
+  const areaPath = `M ${x(ds[0])},${H} L ${pts.join(' L ')} L ${x(maxD)},${H} Z`;
   const gradId   = `grad-${color.replace('#', '')}`;
 
   const fmt = (v: number) => decimals === 0 ? String(Math.round(v)) : v.toFixed(decimals);
+  const fmtDist = (d: number) => (d / 1000).toFixed(1);
 
   return (
     <>
@@ -429,13 +437,50 @@ function MetricChart({
         <Path d={areaPath} fill={`url(#${gradId})`} />
         <Path d={linePath} fill="none" stroke={color} strokeWidth="1.5" strokeLinejoin="round" />
       </Svg>
-      <Text style={[styles.chartLabel, { color: '#3f3f46', marginBottom: 10 }]}>{fmt(minV)} {unit}</Text>
+      <Text style={[styles.chartLabel, { color: '#3f3f46', marginBottom: 10 }]}>
+        {fmt(minV)} {unit} • {fmtDist(maxD)} km
+      </Text>
     </>
   );
 }
 
 // ── Helpers ───────────────────────────────────────────────────────────────────
 
+function calculateDistanceFromCoords(
+  lats: (number | null)[] | null | undefined,
+  lons: (number | null)[] | null | undefined,
+): number[] {
+  if (!lats || !lons) return [];
+
+  const distances: number[] = [0];
+  let cumulative = 0;
+
+  for (let i = 1; i < lats.length; i++) {
+    const lat1 = lats[i - 1];
+    const lon1 = lons[i - 1];
+    const lat2 = lats[i];
+    const lon2 = lons[i];
+
+    if (lat1 == null || lon1 == null || lat2 == null || lon2 == null) {
+      distances.push(cumulative);
+      continue;
+    }
+
+    // Haversine formula
+    const R = 6371000; // Earth's radius in meters
+    const dLat = (lat2 - lat1) * Math.PI / 180;
+    const dLon = (lon2 - lon1) * Math.PI / 180;
+    const a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
+              Math.cos(lat1 * Math.PI / 180) * Math.cos(lat2 * Math.PI / 180) *
+              Math.sin(dLon / 2) * Math.sin(dLon / 2);
+    const c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+    cumulative += R * c;
+    distances.push(cumulative);
+  }
+
+  return distances;
+}
+
 // Returns [west, south, east, north] per LngLatBounds spec
 function geoJsonBounds(gj: object): [number, number, number, number] | null {
   const coords: [number, number][] = [];