sonner on routing error, and dark mode

website/package-lock.json

@@ -15,8 +15,10 @@
                 "gpx": "file:../gpx",
                 "lucide-svelte": "^0.365.0",
                 "mapbox-gl": "^3.2.0",
+                "mode-watcher": "^0.3.0",
                 "sortablejs": "^1.15.2",
                 "svelte-i18n": "^4.0.0",
+                "svelte-sonner": "^0.3.22",
                 "tailwind-merge": "^2.2.2",
                 "tailwind-variants": "^0.2.1"
             },
@@ -3939,6 +3941,14 @@
                 "mkdirp": "bin/cmd.js"
             }
         },
+        "node_modules/mode-watcher": {
+            "version": "0.3.0",
+            "resolved": "https://registry.npmjs.org/mode-watcher/-/mode-watcher-0.3.0.tgz",
+            "integrity": "sha512-k8jjuTx94HaaRKWO6JDf8wL761hFatrTIHJKl+E+3JWcnv+GnMBH062zcLsy0lbCI3n7RZxxHaWi66auFnUO4g==",
+            "peerDependencies": {
+                "svelte": "^4.0.0"
+            }
+        },
         "node_modules/mri": {
             "version": "1.2.0",
             "resolved": "https://registry.npmjs.org/mri/-/mri-1.2.0.tgz",
@@ -5745,6 +5755,14 @@
                 }
             }
         },
+        "node_modules/svelte-sonner": {
+            "version": "0.3.22",
+            "resolved": "https://registry.npmjs.org/svelte-sonner/-/svelte-sonner-0.3.22.tgz",
+            "integrity": "sha512-1AEBl7rTP4oeMAmBmkcvoHNOwB8gPzz73RYApcY8pyDwbjBewU8ATnXV8N42omV1sQvtSX/X0o5A1nfkN3T6cg==",
+            "peerDependencies": {
+                "svelte": ">=3 <5"
+            }
+        },
         "node_modules/tabbable": {
             "version": "6.2.0",
             "resolved": "https://registry.npmjs.org/tabbable/-/tabbable-6.2.0.tgz",