# Frontend: Overview

---
**Phase:** Phase 0 (Planning)  
**Status:** Draft  
**Owner:** Frontend Architect  
**References:**
- `/docs/project-overview.md` (product goals)
- `/docs/frontend/architecture.md` (technical approach)
- `/docs/content-structure.md` (screens and flows)
---

## 1. Role of Frontend
- Deliver the primary user experience for your chosen archetype (chat, generation workflow, pipeline review, automation dashboard) plus onboarding/settings and optional billing.
- Keep flows fast, explainable (surface reasoning traces/scores when used), and safe (reflect provider states, avoid double actions).

## 2. Core Screens & Flows
- Core screens depend on the chosen archetype (see `/docs/archetypes.md`).  
  Example for pipeline products:
  - Marketing/landing with CTA to signup.
  - Onboarding: signup/login, plan selection (provider Checkout/Portal if applicable), source connection (OAuth2/webhooks), team invites.
  - Items/records: lists/filters, detail drawer (raw fields, scores, LLM reasoning trace), bulk actions.
  - Human review (optional): approval/override UI, optional rules/policies editor.
  - Reports (optional): dashboards/summaries, exports.
  - Billing & Settings (optional): subscription status, payment method, tenant/team management, integrations health, audit/event log view.

## 3. Technical Principles
- Next.js (App Router) with TypeScript; Tailwind for styling; React Query/SWR for data fetching and cache orchestration.
- Feature-first structure; keep state local to features when possible.
- Prefer Server Components; mark client components explicitly; use route handlers/server actions where appropriate.
- Strong loading/error/empty states for data-heavy lists; avoid blocking UX during long jobs (categorization replays, exports).

## 4. Backend Interaction
- All data via backend APIs; frontend never calls external providers (data, payment, LLM) directly.
- Payments: initiate via backend (payment provider session/portal) and show statuses driven by webhooks.
- LLM: never called from the browser; surfaced reasoning traces come from backend responses.
- Auth: Clerk/Auth.js; guard routes per tenant/role; handle token refresh gracefully.

## 5. I18n
- Primary UI in English; other locales optional. Keep copy concise and domain-appropriate.