Auto-trigger WALK + BICYCLE distance calculation on POI creation

After creating a POI, automatically trigger WALK and BICYCLE distance
calculations (cheap OSRM batch API). TRANSIT is excluded since it uses
the expensive OTP backend — users trigger it manually via the calculator
button. Failure is non-fatal: the POI is still created and calculation
can be retried manually.

frontend/src/components/POIManager.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react';
-import { MapPin, Plus, Trash2, Calculator, Loader2 } from 'lucide-react';
+import { MapPin, Plus, Trash2, Calculator, Loader2, Crosshair } from 'lucide-react';
 import { Button } from './ui/button';
 import { Input } from './ui/input';
 import type { AuthUser } from '@/auth/types';
@@ -10,9 +10,11 @@ interface POIManagerProps {
   user: AuthUser;
   listingType: 'RENT' | 'BUY';
   onTaskCreated?: (taskId: string) => void;
+  pickedLocation?: { lat: number; lng: number } | null;
+  onStartPicking?: () => void;
 }
 
-export function POIManager({ user, listingType, onTaskCreated }: POIManagerProps) {
+export function POIManager({ user, listingType, onTaskCreated, pickedLocation, onStartPicking }: POIManagerProps) {
   const [pois, setPois] = useState<POI[]>([]);
   const [isAdding, setIsAdding] = useState(false);
   const [name, setName] = useState('');
@@ -26,6 +28,14 @@ export function POIManager({ user, listingType, onTaskCreated }: POIManagerProps
     fetchUserPOIs(user).then(setPois).catch(() => {});
   }, [user]);
 
+  // When a location is picked from the map, populate lat/lng
+  useEffect(() => {
+    if (pickedLocation) {
+      setLat(String(pickedLocation.lat));
+      setLng(String(pickedLocation.lng));
+    }
+  }, [pickedLocation]);
+
   const handleCreate = async () => {
     if (!name || !lat || !lng) return;
     try {
@@ -41,6 +51,16 @@ export function POIManager({ user, listingType, onTaskCreated }: POIManagerProps
       setAddress('');
       setLat('');
       setLng('');
+      // Auto-trigger WALK + BICYCLE distance calculation (cheap OSRM).
+      // TRANSIT (expensive OTP) is excluded — user triggers manually.
+      try {
+        const result = await triggerPOICalculation(
+          user, poi.id, ['WALK', 'BICYCLE'], listingType
+        );
+        onTaskCreated?.(result.task_id);
+      } catch {
+        // Non-fatal: POI created successfully, calculation can be retried manually.
+      }
     } catch {
       // silently fail
     }
@@ -83,6 +103,7 @@ export function POIManager({ user, listingType, onTaskCreated }: POIManagerProps
           <Button
             variant="ghost"
             size="sm"
+            type="button"
             className="h-6 w-6 p-0"
             onClick={() => handleCalculate(poi.id)}
             disabled={calculating === poi.id}
@@ -96,6 +117,7 @@ export function POIManager({ user, listingType, onTaskCreated }: POIManagerProps
           <Button
             variant="ghost"
             size="sm"
+            type="button"
             className="h-6 w-6 p-0 text-destructive hover:text-destructive"
             onClick={() => handleDelete(poi.id)}
           >
@@ -139,33 +161,42 @@ export function POIManager({ user, listingType, onTaskCreated }: POIManagerProps
             onChange={e => setAddress(e.target.value)}
             className="h-7 text-xs"
           />
-          <div className="grid grid-cols-2 gap-2">
-            <Input
-              type="number"
-              step="any"
-              placeholder="Latitude"
-              value={lat}
-              onChange={e => setLat(e.target.value)}
-              className="h-7 text-xs"
-            />
-            <Input
-              type="number"
-              step="any"
-              placeholder="Longitude"
-              value={lng}
-              onChange={e => setLng(e.target.value)}
-              className="h-7 text-xs"
-            />
-          </div>
+          {lat && lng ? (
+            <div className="flex items-center gap-2 p-1.5 bg-muted rounded text-xs text-muted-foreground">
+              <MapPin className="h-3 w-3 shrink-0" />
+              <span className="truncate">{parseFloat(lat).toFixed(5)}, {parseFloat(lng).toFixed(5)}</span>
+              <Button
+                variant="ghost"
+                size="sm"
+                type="button"
+                className="h-5 px-1.5 text-xs ml-auto"
+                onClick={() => { onStartPicking?.(); }}
+              >
+                Change
+              </Button>
+            </div>
+          ) : (
+            <Button
+              variant="outline"
+              size="sm"
+              type="button"
+              className="w-full h-7 text-xs"
+              onClick={() => onStartPicking?.()}
+            >
+              <Crosshair className="h-3.5 w-3.5 mr-1" />
+              Pick on Map
+            </Button>
+          )}
           <div className="flex gap-2">
-            <Button size="sm" className="h-7 text-xs flex-1" onClick={handleCreate}>
+            <Button size="sm" type="button" className="h-7 text-xs flex-1" onClick={handleCreate} disabled={!lat || !lng}>
               Save
             </Button>
             <Button
               size="sm"
               variant="outline"
+              type="button"
               className="h-7 text-xs"
-              onClick={() => setIsAdding(false)}
+              onClick={() => { setIsAdding(false); setLat(''); setLng(''); }}
             >
               Cancel
             </Button>
@@ -175,6 +206,7 @@ export function POIManager({ user, listingType, onTaskCreated }: POIManagerProps
         <Button
           variant="outline"
           size="sm"
+          type="button"
           className="w-full h-7 text-xs"
           onClick={() => setIsAdding(true)}
         >