---
phase: 16-frontend-scaffold
plan: 01
subsystem: ui
tags: [vite, react, typescript, tailwindcss, shadcn-ui, postcss]

# Dependency graph
requires:
  - phase: 15-frontend-wireframes
    provides: UI design wireframes for dashboard, detail, and inbox screens
provides:
  - Vite + React + TypeScript project at packages/web/
  - Tailwind CSS with shadcn/ui theming and cn() utility
  - Path alias @/ for clean imports
  - Dev server with tRPC proxy to backend
  - npm workspaces linking packages/web
affects: [16-frontend-scaffold remaining plans, 17-initiative-dashboard, 18-initiative-detail, 19-agent-inbox]

# Tech tracking
tech-stack:
  added: [vite, react, react-dom, tailwindcss, postcss, autoprefixer, shadcn-ui, class-variance-authority, clsx, tailwind-merge, lucide-react, tailwindcss-animate, @tailwindcss/typography]
  patterns: [npm workspaces monorepo, @/ path alias convention, shadcn/ui CSS variable theming]

key-files:
  created: [packages/web/package.json, packages/web/vite.config.ts, packages/web/tsconfig.json, packages/web/tsconfig.app.json, packages/web/index.html, packages/web/src/main.tsx, packages/web/src/App.tsx, packages/web/src/index.css, packages/web/postcss.config.js, packages/web/tailwind.config.ts, packages/web/components.json, packages/web/src/lib/utils.ts]
  modified: [package.json, package-lock.json]

key-decisions:
  - "16-01: CSS import added to main.tsx (not in original Task 1 — required for Tailwind output)"
  - "16-01: App.tsx uses cn() from @/lib/utils to verify both path alias and Tailwind integration in one shot"

patterns-established:
  - "@/ path alias: all imports from src/ use @/ prefix (shadcn convention)"
  - "shadcn/ui CSS variables: HSL-based theming with light/dark mode via .dark class"

# Metrics
duration: 3min
completed: 2026-02-04
---

# Phase 16 Plan 01: Vite + React + Tailwind + shadcn/ui Summary

**Vite 6 + React 19 project with Tailwind CSS v3 theming and shadcn/ui component foundation in packages/web/**

## Performance

- **Duration:** 3 min
- **Started:** 2026-02-04T17:55:00Z
- **Completed:** 2026-02-04T18:02:00Z
- **Tasks:** 2
- **Files modified:** 14

## Accomplishments
- Vite + React + TypeScript project scaffolded in packages/web/ with dev server and tRPC proxy
- Tailwind CSS v3 configured with PostCSS, autoprefixer, typography, and animate plugins
- shadcn/ui theming with CSS custom properties (light + dark mode), components.json, and cn() utility
- Path alias `@/` configured in both vite.config.ts and tsconfig.app.json
- npm workspaces configured at root linking packages/web

## Task Commits

Each task was committed atomically:

1. **Task 1: Create Vite + React + TypeScript project** - `99348e0` (feat)
2. **Task 2: Configure Tailwind CSS and shadcn/ui** - `bb468e0` (feat)

## Files Created/Modified
- `packages/web/package.json` - Web package with React, Tailwind, shadcn deps
- `packages/web/vite.config.ts` - Vite config with React plugin, @/ alias, tRPC proxy
- `packages/web/tsconfig.json` - Root TS config extending tsconfig.app.json
- `packages/web/tsconfig.app.json` - App TS config with @/ path mapping
- `packages/web/index.html` - Vite entry HTML
- `packages/web/src/main.tsx` - React root mount with CSS import
- `packages/web/src/App.tsx` - Minimal component using cn() and Tailwind classes
- `packages/web/src/index.css` - Tailwind directives + shadcn CSS variables (light/dark)
- `packages/web/postcss.config.js` - PostCSS with tailwindcss and autoprefixer
- `packages/web/tailwind.config.ts` - Tailwind config with shadcn color system and plugins
- `packages/web/components.json` - shadcn/ui configuration
- `packages/web/src/lib/utils.ts` - cn() utility combining clsx + tailwind-merge
- `package.json` - Added workspaces and dev:web script
- `package-lock.json` - Updated lockfile

## Decisions Made
- CSS import added to main.tsx during Task 2 (was missing from Task 1, required for Tailwind output in build)
- App.tsx uses cn() from @/lib/utils to verify both path alias resolution and Tailwind integration simultaneously

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Added CSS import to main.tsx**
- **Found during:** Task 2 verification (build had no CSS output)
- **Issue:** main.tsx did not import index.css, so Tailwind directives were never processed and no CSS appeared in build output
- **Fix:** Added `import "./index.css"` to main.tsx
- **Files modified:** packages/web/src/main.tsx
- **Verification:** Vite build now outputs CSS file with Tailwind resets and utility classes
- **Committed in:** bb468e0 (Task 2 commit)

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Essential fix for Tailwind to function. No scope creep.

## Issues Encountered
None

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

## Next Phase Readiness
- Frontend scaffold with Tailwind + shadcn/ui ready for component development
- Next plan 16-02 (Shared Types Package) already completed
- Ready for 16-03 (tRPC Client Wiring)

---
*Phase: 16-frontend-scaffold*
*Completed: 2026-02-04*
