feat(error): add error handling on test screen

src/stores/useExamConfigStore.ts

@@ -5,6 +5,7 @@ import type { StartExamPayload, ExamMode } from "../types/test";
 
 interface ExamConfigState {
   payload: StartExamPayload | null;
+  userXp: number;
 
   setSheetId: (id: string) => void;
   storeTopics: (ids: string[]) => void;
@@ -14,6 +15,7 @@ interface ExamConfigState {
   storeDuration: (minutes: number) => void;
   setMode: (mode: ExamMode) => void;
   setSection: (section: string) => void;
+  setUserXp: (section: number) => void;
 
   clearPayload: () => void;
 }
@@ -22,6 +24,7 @@ export const useExamConfigStore = create<ExamConfigState>()(
   persist(
     (set, get) => ({
       payload: null,
+      userXp: 0,
 
       setSheetId: (sheet_id) =>
         set({
@@ -45,6 +48,13 @@ export const useExamConfigStore = create<ExamConfigState>()(
             section,
           } as StartExamPayload,
         }),
+      setUserXp: (userXp) =>
+        set({
+          payload: {
+            ...(get().payload ?? {}),
+            userXp,
+          } as StartExamPayload,
+        }),
 
       setDifficulty: (difficulty) =>
         set({