---
phase: 10-ux-interaction
plan: "04"
subsystem: frontend/ui
tags: [toast, pinia, vue3, ux, notifications]
dependency_graph:
  requires: []
  provides: [toast-store, toast-container]
  affects: [App.vue, SettingsAccountTab.vue, TotpEnrollment.vue]
tech_stack:
  added: []
  patterns: [setup-store, Options-API-component, Teleport-to-body, TransitionGroup]
key_files:
  created:
    - frontend/src/stores/toast.js
    - frontend/src/components/ui/ToastContainer.vue
    - frontend/src/stores/__tests__/toast.test.js
    - frontend/src/components/ui/__tests__/ToastContainer.test.js
  modified:
    - frontend/src/App.vue
decisions:
  - "toast.js uses Pinia setup-store form; signature show(message, type, duration) locked to match Phase 8 call sites"
  - "ToastContainer uses Options API with data() { return { toastStore: useToastStore() } } for store wiring"
  - "Teleport stubs in tests prevent body-teleport from interfering with wrapper.find() assertions"
metrics:
  duration: "2m 27s"
  completed: "2026-06-15T18:11:36Z"
  tasks_completed: 2
  files_changed: 5
---

# Phase 10 Plan 04: Toast Notification System Summary

**One-liner:** Reactive Pinia toast store with auto-dismiss + Teleport-based ToastContainer mounted in App.vue, replacing the Phase 8 no-op stub.

## Tasks Completed

| Task | Name | Commit | Files |
|------|------|--------|-------|
| 1 | Write failing tests for toast store + ToastContainer | b12137c | `stores/__tests__/toast.test.js`, `components/ui/__tests__/ToastContainer.test.js` |
| 2 | Implement toast.js store + ToastContainer.vue + mount in App.vue | f92d98d | `stores/toast.js`, `components/ui/ToastContainer.vue`, `App.vue` |

## What Was Built

**toast.js (stores):** Replaced the Phase 8 no-op stub with a full Pinia setup-store implementation. Exports `{ toasts, show, dismiss }`. `toasts` is a `ref([])` reactive array. `show(message, type='success', duration=4000)` pushes `{ id, message, type, duration }` and schedules `setTimeout(() => dismiss(id), duration)` when `duration > 0`. `dismiss(id)` filters the array by id. The locked signature `show(message, type, duration)` is preserved — Phase 8 call sites in `SettingsAccountTab.vue` and `TotpEnrollment.vue` work unchanged.

**ToastContainer.vue (components/ui):** Options API component. Uses `<Teleport to="body">` with `<TransitionGroup name="toast">`. Container div is `fixed bottom-4 right-4 z-[9999] flex flex-col-reverse gap-2 pointer-events-none`. Each toast item has `data-test="toast"` for testing, a colored left-accent bar (`w-1 self-stretch`), an `<AppIcon>` with type-driven name and color, and the message paragraph. Clicking dismisses via `toastStore.dismiss(toast.id)`. CSS transition: `all 0.2s ease` with `opacity: 0; transform: translateX(20px)` for enter-from/leave-to.

**App.vue:** Added `import ToastContainer` and `<ToastContainer />` placed after the `<div v-else>` layout block so it floats above all routes including AuthLayout.

## Verification Results

| Check | Result |
|-------|--------|
| `npm run test -- --run toast` (6 store + 4 container = 10 tests) | PASS |
| `npm run test -- --run ToastContainer` (4 tests) | PASS |
| `npm run test -- --run SettingsAccountTab` (regression) | PASS (7 tests) |
| `npm run test -- --run TotpEnrollment` (regression) | PASS (4 tests) |
| Locked signature grep | PASS (1 match) |
| `<ToastContainer` in App.vue | PASS (2 occurrences) |
| `Teleport to="body"` in ToastContainer | PASS |

## Deviations from Plan

None — plan executed exactly as written.

## Known Stubs

None.

## Threat Flags

None. Toast notification is a purely client-side display system with no network endpoints, auth paths, or file access.

## Self-Check: PASSED

- `frontend/src/stores/toast.js` — exists and contains implementation
- `frontend/src/components/ui/ToastContainer.vue` — exists with Teleport + data-test attributes
- `frontend/src/App.vue` — contains ToastContainer import and element
- Task 1 commit b12137c — verified in git log
- Task 2 commit f92d98d — verified in git log