feat: Implement dedicated dashboard service and data models, revamp upcoming transactions UI, and update dashboard charts to use new category data.

src/utils/utils.ts

@@ -89,3 +89,9 @@ export const getRandomColor = () => {
     
 }
 
+export const toDateOnly = (d : Date): string => {
+    const y = d.getFullYear();
+    const m = String(d.getMonth() + 1).padStart(2, '0');
+    const day = String(d.getDate()).padStart(2, '0');
+    return `${y}-${m}-${day}`;
+}