full frontend refactor

ui/src/utils/coordinates.js

@@ -0,0 +1,42 @@
+// ============================================================================
+// COORDINATE & DISTANCE FORMATTING UTILITIES
+// ============================================================================
+
+/**
+ * Format coordinate to 6 decimal places (±11cm precision)
+ */
+export function formatCoordinate(value, type) {
+  const dir = type === 'lat' 
+    ? (value >= 0 ? 'N' : 'S')
+    : (value >= 0 ? 'E' : 'W');
+  return `${Math.abs(value).toFixed(6)}°${dir}`;
+}
+
+/**
+ * Format distance in meters or feet based on unit preference
+ */
+export function formatDistance(meters, useImperial = false) {
+  if (useImperial) {
+    const feet = meters * 3.28084;
+    if (feet < 5280) {
+      return `${feet.toFixed(1)} ft`;
+    } else {
+      const miles = feet / 5280;
+      return `${miles.toFixed(2)} mi`;
+    }
+  } else {
+    if (meters < 1000) {
+      return `${meters.toFixed(1)} m`;
+    } else {
+      const km = meters / 1000;
+      return `${km.toFixed(2)} km`;
+    }
+  }
+}
+
+/**
+ * Format bearing angle
+ */
+export function formatBearing(degrees) {
+  return `${degrees.toFixed(1)}°`;
+}