add mode watcher

Author: Vincent van der Wal

package-lock.json

@@ -51,12 +51,14 @@
 		"globals": "^16.0.0",
 		"maplibre-gl": "^5.6.1",
 		"mdsvex": "^0.12.3",
+		"mode-watcher": "^1.1.0",
 		"playwright": "^1.53.0",
 		"prettier": "^3.4.2",
 		"prettier-plugin-svelte": "^3.3.3",
 		"prettier-plugin-tailwindcss": "^0.6.11",
 		"svelte": "^5.0.0",
 		"svelte-check": "^4.0.0",
+		"svelte-sonner": "^1.0.5",
 		"tailwind-merge": "^3.3.1",
 		"tailwind-variants": "^1.0.0",
 		"tailwindcss": "^4.0.0",