Timer is persistent with Local Storage. Drag&Drop of planned sets fixed on mobile.

package.json

@@ -15,6 +15,9 @@
     "test:full": "npm-run-all --parallel dev server:test"
   },
   "dependencies": {
+    "@dnd-kit/core": "^6.3.1",
+    "@dnd-kit/sortable": "^10.0.0",
+    "@dnd-kit/utilities": "^3.2.2",
     "@google/genai": "^1.30.0",
     "lucide-react": "^0.554.0",
     "npm-run-all": "^4.1.5",
@@ -36,4 +39,4 @@
     "typescript": "~5.8.2",
     "vite": "^6.2.0"
   }
-}
+}