feat : ajout d'une gestion d'erreur au global côté front avec la lib toaster et I18n pour centraliser les messages d'erreur

AGENTS.md

@@ -22,17 +22,24 @@ Frontend conventions
 - Layout in `frontend/layouts/default.vue`: max width `1050px`, header full width.
 - Tailwind custom color palette is `primary` (e.g. `bg-primary-500`).
 - API composable in `frontend/composables/useApi.ts` with `get/post/put/patch/delete` and default JSON/PATCH content types.
+- API errors/success toasts can be customized via `toastErrorMessage`/`toastSuccessMessage` or i18n keys `toastErrorKey`/`toastSuccessKey`. Global method fallbacks use `errors.http.*` keys.
+- `useApi` uses `useNuxtApp().$i18n` (not `useI18n`) to avoid setup-only constraint in service calls.
 - Pinia store: `frontend/stores/reception.ts` is the source of truth for the current reception.
 - Zod is used for form validation (e.g. `frontend/components/reception/reception-form.vue`); shared helpers live in `frontend/utils/zod-errors.ts`.
 - Weighing logic is shared via `frontend/composables/useWeighing.ts`.
 - Reception step UI uses store state (`currentStep`) in `frontend/pages/reception/[[id]].vue`.
 - Active nav styles in header use `NuxtLink` with `custom` slot.
 - Reusable UI components live under `frontend/components/ui/` and are auto-imported with `Ui` prefix (e.g. `UiLoadingDots`).
+- Service layer lives in `frontend/services/` with typed DTOs in `frontend/services/dto/`.
+- Reception service uses `receptions`, `receptions/{id}`, `receptions/weigh` and supports success/error toast keys.
+- Reception receipt endpoint is `receptions/{id}/receipt` (PDF) via `frontend/composables/usePdfPrinter.ts`.
 
 Environment & routing
 - Frontend dev server: `npm run dev` in `frontend/`.
 - API base for local dev: `http://localhost:8080/api` (set in `frontend/.env` via `NUXT_PUBLIC_API_BASE`).
 - CORS handled by Nelmio; `.env` includes `CORS_ALLOW_ORIGIN` regex for localhost.
+- Nuxt i18n locales live in `frontend/i18n/locales` (configured via `langDir: 'locales'`).
+- Default locale is `fr`; translations in `frontend/i18n/locales/fr.json`.
 
 Notes
 - Do not add a GET that creates resources; use POST + PATCH.