Make meeting point coordinates optional on tour creation

- Latitude/longitude fields are now optional for local/national tours
- If provided, both must be filled and valid; otherwise geohash and
  coords tags are omitted from the published event
- Updated input placeholders and added helper text clarifying coordinates
  are optional

Co-authored-by: shakespeare.diy <assistant@shakespeare.diy>

src/pages/CreateTourPage.tsx

@@ -441,19 +441,20 @@ export default function CreateTourPage() {
       return;
     }
 
-    // Coordinates required only for local/national tours
-    if ((tourCategory === 'local' || tourCategory === 'national') && (!meetingLat || !meetingLng)) {
+    // Coordinates are optional. If one is provided, both must be provided and valid.
+    let lat = 0;
+    let lng = 0;
+    let hasCoords = false;
+    if ((tourCategory === 'local' || tourCategory === 'national') && (meetingLat || meetingLng)) {
+      if (!meetingLat || !meetingLng) {
         toast({
-        title: 'Meeting point coordinates required',
-        description: 'Please enter coordinates or use your current location.',
+          title: 'Incomplete coordinates',
+          description: 'Please enter both latitude and longitude, or leave both empty.',
           variant: 'destructive',
         });
         return;
       }
 
-    let lat = 0;
-    let lng = 0;
-    if (tourCategory === 'local' || tourCategory === 'national') {
       lat = parseFloat(meetingLat);
       lng = parseFloat(meetingLng);
 
@@ -465,6 +466,8 @@ export default function CreateTourPage() {
         });
         return;
       }
+
+      hasCoords = true;
     }
 
     // Spot types required only for non-destruction tours
@@ -509,7 +512,7 @@ export default function CreateTourPage() {
 
     try {
       // Generate low-precision geohash for city-level location (4 chars = ~39km)
-      const geohash = ngeohash.encode(lat, lng, 4);
+      const geohash = hasCoords ? ngeohash.encode(lat, lng, 4) : '';
 
       // Create unique identifier
       const identifier = title
@@ -528,11 +531,14 @@ export default function CreateTourPage() {
 
       // Location/geohash only for local/national tours
       if (tourCategory === 'local' || tourCategory === 'national') {
-        tags.push(['g', geohash]);
         tags.push(['location', location.trim()]);
         tags.push(['meeting-point', meetingPoint.trim()]);
+        // Coordinates are optional - only include when provided
+        if (hasCoords) {
+          tags.push(['g', geohash]);
           tags.push(['meeting-point-coords', lat.toString(), lng.toString()]);
         }
+      }
 
       // Duration - store in appropriate unit
       const durationVal = tourCategory === 'destruction' 
@@ -1022,23 +1028,24 @@ export default function CreateTourPage() {
                 <div className="grid grid-cols-2 gap-4 mt-3">
                   <div>
                     <Input
-                      placeholder="Latitude"
+                      placeholder="Latitude (optional)"
                       value={meetingLat}
                       onChange={(e) => setMeetingLat(e.target.value)}
                       className="bg-black border-cyan-500/30"
-                      required
                     />
                   </div>
                   <div>
                     <Input
-                      placeholder="Longitude"
+                      placeholder="Longitude (optional)"
                       value={meetingLng}
                       onChange={(e) => setMeetingLng(e.target.value)}
                       className="bg-black border-cyan-500/30"
-                      required
                     />
                   </div>
                 </div>
+                <p className="text-[11px] text-gray-500 mt-1">
+                  Coordinates are optional. Add them to pin your meeting point on the map.
+                </p>
                 <Button
                   type="button"
                   variant="outline"