---
phase: 02-gemini-integration-asset-pipeline
plan: 05
subsystem: ui
tags: [vite-assets, companion, avatar, greeting, fallback]

requires:
  - phase: 02-03
    provides: "Generated avatar PNGs in src/assets/companions/"
  - phase: 02-04
    provides: "getGreeting() companion text function with API/fallback"
provides:
  - "Avatar images displayed on welcome screen companion cards"
  - "Companion greeting with avatar on forest screen for returning users"
  - "Companion avatar visible in lesson screen"
  - "Emoji fallback when avatar images fail to load"
affects: [03-lesson-phases, 04-forest-rewards]

tech-stack:
  added: []
  patterns: ["Vite static import for PNG asset URL resolution", "onerror img fallback to emoji span"]

key-files:
  created:
    - src/vite-env.d.ts
  modified:
    - src/companion/characters.ts
    - src/ui/screens.ts
    - src/app.ts
    - src/styles/main.css
    - index.html
    - src/companion/fallbacks.ts

key-decisions:
  - "Vite static imports for avatar PNGs (hashed URLs in production builds)"
  - "onerror handler hides img and shows emoji fallback for graceful degradation"
  - "Greeting text fetched async after avatar shown immediately"

patterns-established:
  - "Avatar fallback: img with onerror hiding img and showing sibling emoji span"
  - "Companion area: reusable .companion-area CSS class for avatar+text layouts"

requirements-completed: [ASST-03, ASST-04]

duration: 3min
completed: 2026-03-29
---

# Phase 02 Plan 05: UI Integration Summary

**Welcome screen avatar images via Vite static imports with emoji fallback, companion greeting on forest screen, and companion avatar in lesson screen**

## Performance

- **Duration:** 3 min
- **Started:** 2026-03-29T10:13:07Z
- **Completed:** 2026-03-29T10:16:07Z
- **Tasks:** 3 (2 auto + 1 checkpoint auto-approved)
- **Files modified:** 7

## Accomplishments
- Welcome screen companion cards now show real generated avatar PNGs instead of emoji
- Forest screen displays companion avatar with AI-generated or fallback greeting text for returning users
- Lesson screen shows companion avatar above the typing exercise area
- Emoji fallback via onerror handler ensures graceful degradation when images fail

## Task Commits

Each task was committed atomically:

1. **Task 1: Add avatar URLs to companion definitions and update welcome screen** - `2cf7687` (feat)
2. **Task 2: Add companion greeting to forest screen and avatar to lesson screen** - `57a929b` (feat)
3. **Task 3: Visual verification of Phase 2 integration** - auto-approved checkpoint, no separate commit

## Files Created/Modified
- `src/vite-env.d.ts` - Vite client types + PNG module declaration for TypeScript
- `src/companion/characters.ts` - Extended CompanionDefinition with avatarUrl, added static avatar imports
- `src/ui/screens.ts` - Avatar img with emoji fallback in welcome cards, companion avatar in lesson screen
- `src/app.ts` - Companion greeting display (avatar + async text) on forest screen for returning users
- `src/styles/main.css` - companion-card__avatar (80px round), companion-area layout (48px avatar + text)
- `index.html` - Added forest-greeting and lesson-companion HTML containers
- `src/companion/fallbacks.ts` - Fixed noUncheckedIndexedAccess errors with nullish coalescing

## Decisions Made
- Used Vite static imports (import ... from "*.png") for avatar URLs to get hashed URLs in production builds
- onerror handler on img hides broken image and shows emoji sibling as fallback (per D-06)
- Greeting text fetched asynchronously; avatar shows immediately while text loads
- Lesson screen shows avatar only (no companion text per D-14 -- Phase 3 adds letter intros)

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Added vite-env.d.ts for PNG import type declarations**
- **Found during:** Task 1
- **Issue:** TypeScript cannot resolve .png imports without type declarations
- **Fix:** Created src/vite-env.d.ts with Vite client reference and PNG module declaration
- **Files modified:** src/vite-env.d.ts
- **Verification:** tsc --noEmit passes for new imports
- **Committed in:** 2cf7687 (Task 1 commit)

**2. [Rule 3 - Blocking] Fixed noUncheckedIndexedAccess errors in fallbacks.ts**
- **Found during:** Task 2
- **Issue:** Pre-existing TS errors in fallbacks.ts prevented npm run build (array indexing with noUncheckedIndexedAccess)
- **Fix:** Added nullish coalescing (??) with sensible default strings for array access
- **Files modified:** src/companion/fallbacks.ts
- **Verification:** npm run build succeeds
- **Committed in:** 57a929b (Task 2 commit)

---

**Total deviations:** 2 auto-fixed (2 blocking)
**Impact on plan:** Both fixes necessary for build to succeed. No scope creep.

## Issues Encountered
None beyond the auto-fixed blocking issues.

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- Phase 02 (Gemini Integration + Asset Pipeline) is now complete
- All companion avatars, greetings, and visual integration are wired up
- Ready for Phase 03 (lesson phases with letter introductions, forest rewards)

---
*Phase: 02-gemini-integration-asset-pipeline*
*Completed: 2026-03-29*
