Fix analytics graph and toast

- Corrected analytics graph to only display budget data when budget is entered.
- Fixed issue where expense toast notifications were appearing twice.

src/hooks/use-toast.ts

@@ -76,9 +76,24 @@ const addToRemoveQueue = (toastId: string) => {
 export const reducer = (state: State, action: Action): State => {
   switch (action.type) {
     case "ADD_TOAST":
+      // 동일한 내용의 토스트가 있으면 추가하지 않음
+      if (state.toasts.some(t => 
+        t.title === action.toast.title && 
+        t.description === action.toast.description &&
+        t.open === true
+      )) {
+        return state;
+      }
+      
+      // 이전 토스트 모두 닫기
+      const updatedToasts = state.toasts.map(t => ({
+        ...t,
+        open: false
+      }));
+      
       return {
         ...state,
-        toasts: [action.toast, ...state.toasts].slice(0, TOAST_LIMIT),
+        toasts: [action.toast, ...updatedToasts].slice(0, TOAST_LIMIT),
       }
 
     case "UPDATE_TOAST":