refactor/Adapted BudgetView for new OpenAPI typescript generating

src/api/index.ts

src/api/models/ChallengeDTO.ts

src/api/models/CreateGoalDTO.ts

src/api/models/DailyChallengeProgressDTO.ts

src/api/models/GoalDTO.ts

src/api/services/GoalService.ts

src/api/services/LeaderboardService.ts

src/api/services/UserService.ts

src/assets/icons/calculator.svg

src/components/Budget/Modal/ConfirmDeleteModal.vue

src/components/Budget/Modal/ImportBudgetModal.vue

...s/Configuration/ConfigurationSteps/SuitableChallenges.vue

src/views/Budget/BudgetOverview.vue

src/views/Budget/BudgetView.vue