anti cheat: don't trust the client, move trip completions to server

frontend/app.js

@@ -969,9 +969,21 @@ async function calculateAndStartRoute(startAddress, endAddress, isRestoring = fa
             };
 
             // Initialize step reference
+            // Initialize/Reset Server Trip
             // Only start a new trip on server if this is a fresh start, not a restore
             if (!isRestoring) {
-                fetch('/api/trip', { method: 'POST' }).catch(console.error);
+                const tripMetadata = {
+                    trip_type: 'address',
+                    route_name: `${leg.start_address} to ${leg.end_address}`,
+                    start_address: leg.start_address,
+                    end_address: leg.end_address,
+                    total_distance: routeTotalDistance / 1000 // In km
+                };
+                fetch('/api/trip', {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify(tripMetadata)
+                }).catch(console.error);
             }
 
             // Reset display steps for visual consistency
@@ -2126,7 +2138,17 @@ function startFromCustomRoute(pathData, routeName, isRestoring = false, markers
 
     // Initialize/Reset Server Trip
     if (!isRestoring) {
-        fetch('/api/trip', { method: 'POST' }).catch(console.error);
+        const tripMetadata = {
+            trip_type: 'kml',
+            route_name: routeName,
+            kml_id: currentKmlFile ? currentKmlFile.id : null,
+            total_distance: routeTotalDistance / 1000 // In km
+        };
+        fetch('/api/trip', {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify(tripMetadata)
+        }).catch(console.error);
     }
 
     // Reset display steps
@@ -2274,26 +2296,13 @@ async function triggerCelebration(finalDistance) {
     overlay.classList.add('active');
     createConfetti();
 
-    // Report to backend
-    if (currentTripDetails) {
-        try {
-            await fetch('/api/trip/complete', {
-                method: 'POST',
-                headers: { 'Content-Type': 'application/json' },
-                body: JSON.stringify({
-                    type: currentTripDetails.type,
-                    route_name: currentTripDetails.route_name,
-                    start_address: currentTripDetails.start_address || '',
-                    end_address: currentTripDetails.end_address || '',
-                    kml_filename: currentTripDetails.kml_filename || '',
-                    kml_owner_id: currentTripDetails.kml_owner_id || '',
-                    distance: currentTripDetails.distance
-                })
-            });
-        } catch (err) {
-            console.error("Failed to record trip completion:", err);
-        }
-    }
+    // Clean up local state
+    localStorage.removeItem(LOCATION_STORAGE);
+    currentTripDetails = null;
+    masterPath = [];
+    routeTotalDistance = 0;
+    // We keep window.hasCelebrated = true to prevent immediate re-trigger 
+    // but starting a new trip will reset it.
 }
 
 function createConfetti() {