feat: wire up radial menu directions and multi-stop add button

- Radial menu "From here" now sets origin and opens directions panel
- Radial menu "To here" now sets destination, opens directions panel,
  and uses GPS as origin fallback when available
- DirectionsPanel "Add stop" button now creates intermediate stops
- Stops array initialized from routeStart/routeEnd when adding stops

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/components/DirectionsPanel.jsx

@@ -74,8 +74,43 @@ export default function DirectionsPanel({ onClose }) {
   }
 
   const handleAddStop = () => {
-    // For now, show a message - multi-stop UI is complex
+    // Build stops array from current route endpoints if not already populated
-    // TODO: Implement full multi-stop UI
+    let newStops = [...stops]
+    
+    // If stops is empty but we have endpoints, initialize from routeStart/routeEnd
+    if (newStops.length === 0) {
+      if (routeStart) {
+        newStops.push({
+          id: crypto.randomUUID(),
+          lat: routeStart.lat,
+          lon: routeStart.lon,
+          name: routeStart.name || "Start",
+        })
+      }
+      if (routeEnd) {
+        newStops.push({
+          id: crypto.randomUUID(),
+          lat: routeEnd.lat,
+          lon: routeEnd.lon,
+          name: routeEnd.name || "Destination",
+        })
+      }
+    }
+    
+    // Create placeholder intermediate stop
+    const newStop = {
+      id: crypto.randomUUID(),
+      lat: null,
+      lon: null,
+      name: "",
+    }
+    
+    // Insert before destination (last position), or at end if no destination
+    const insertIdx = Math.max(0, newStops.length - 1)
+    newStops.splice(insertIdx, 0, newStop)
+    
+    // Update stops array - reorderStops triggers UI update
+    reorderStops(newStops)
   }
 
   // Check if route has wilderness segments

src/components/MapView.jsx

@@ -1672,13 +1672,24 @@ const MapView = forwardRef(function MapView(_, ref) {
           lon: radialMenu.lon,
           name: radialMenu.centerLabel || radialMenu.lat.toFixed(5) + ", " + radialMenu.lon.toFixed(5),
         }
-        const { routeStart, setRouteEnd, computeRoute } = useStore.getState()
+        const { routeStart, setRouteStart, setRouteEnd, computeRoute, setDirectionsMode, geoPermission, userLocation } = useStore.getState()
+        
         setRouteEnd(place)
+        setDirectionsMode(true)
+        
         if (routeStart) {
           computeRoute()
-        } else {
+        } else if (geoPermission === "granted" && userLocation) {
-          toast("Set starting point first")
+          // Use GPS as origin fallback
+          setRouteStart({
+            lat: userLocation.lat,
+            lon: userLocation.lon,
+            name: "Your location",
+            source: "gps",
+          })
+          computeRoute()
         }
+        // If no origin and no GPS, directions panel opens and origin field auto-focuses
       },
     },
     {
@@ -1692,16 +1703,16 @@ const MapView = forwardRef(function MapView(_, ref) {
           lon: radialMenu.lon,
           name: radialMenu.centerLabel || radialMenu.lat.toFixed(5) + ", " + radialMenu.lon.toFixed(5),
         }
-        const { clearRoute, setRouteStart, routeEnd, computeRoute } = useStore.getState()
+        const { clearRoute, setRouteStart, routeEnd, computeRoute, setDirectionsMode } = useStore.getState()
         clearRoute()
         clearRouteDisplay(mapInstance.current)
         setRouteStart(place)
-        // If we already have a destination, compute route immediately
+        setDirectionsMode(true)
+        
         if (routeEnd) {
           computeRoute()
-        } else {
-          toast("Now tap destination")
         }
+        // If no destination, directions panel opens and destination field auto-focuses
       },
     },
     {