refactor: enhance routing and state management in CoopBuilder, add migration checks on startup, and update Tailwind configuration for improved component styling

stores/cash.ts

@@ -10,7 +10,7 @@ export const useCashStore = defineStore("cash", () => {
   // Week that first breaches minimum cushion
   const firstBreachWeek = ref(null);
 
-  // Current cash and savings balances - start with zeros
+  // Current cash and savings balances - start empty
   const currentCash = ref(0);
   const currentSavings = ref(0);
 
@@ -111,4 +111,14 @@ export const useCashStore = defineStore("cash", () => {
     stagePayment,
     updateCurrentBalances,
   };
+}, {
+  persist: {
+    key: "urgent-tools-cash",
+    paths: [
+      "currentCash",
+      "currentSavings", 
+      "cashEvents",
+      "paymentQueue"
+    ],
+  },
 });