feat: link impact summary signals to explorer with smooth scroll

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+**ChartImpact** is a full-stack web application that helps teams understand potentially disruptive Helm chart changes before deployment. It compares two versions of a Helm chart and surfaces availability and security risk signals.
+
+- **Frontend**: Next.js 16 (App Router), React 18, TypeScript, TailwindCSS — runs on port 3000
+- **Backend**: Go REST API using Helm SDK and internal diff engine — runs on port 8080
+- **Database**: PostgreSQL 15 (optional, enables stored results and analytics)
+
+## Commands
+
+### Frontend (`/frontend`)
+```bash
+npm install          # Install dependencies
+npm run dev          # Dev server (port 3000)
+npm run build        # Production build
+npm run lint         # ESLint
+npm run type-check   # TypeScript check
+npm test             # Jest tests
+npm run test:watch   # Jest in watch mode
+npm run test:e2e     # Playwright E2E tests
+npm run test:coverage
+```
+
+Run a single Jest test file:
+```bash
+npm test -- --testPathPattern=<filename>
+```
+
+### Backend (`/backend`)
+```bash
+go run cmd/server/main.go     # Dev server (port 8080)
+go test ./...                 # All tests
+go test ./internal/diff/...   # Single package
+go test -run TestFuncName ./...  # Single test
+go test -race ./...           # Race detector
+go build -o server cmd/server # Build binary
+```
+
+### Full Stack
+```bash
+docker-compose up   # Start frontend + backend + postgres
+```
+
+Health check: `curl http://localhost:8080/api/health`
+
+## Architecture
+
+### Request Flow
+1. User submits: repo URL, chart path, two versions, optional values file
+2. Backend shallow-clones the repo, renders Helm manifests for each version
+3. Internal diff engine (`internal/diff/`) compares rendered YAML, returns structured JSON
+4. Frontend displays results in **Classic view** (text diff) or **Explorer view** (structured, resource-level)
+5. Results optionally stored (disk or PostgreSQL) with 30-day TTL
+
+### Backend (`/backend`)
+- **Entry point**: `cmd/server/main.go` — sets up Gorilla Mux routing, middleware, storage
+- **Handlers**: `internal/api/handlers/` — `compare.go`, `versions.go`, `health.go`, `analysis.go`
+- **Helm service**: `internal/service/helm.go` — chart rendering and repo operations
+- **Diff engine**: `internal/diff/` — Kubernetes-aware YAML comparison; enabled by default via `INTERNAL_DIFF_ENABLED=true`
+- **Storage**: `internal/storage/` — plugin interface with `disk.go` and `postgres.go` implementations
+
+### Frontend (`/frontend`)
+- **Pages**: `app/page.tsx` (main), `app/demo/` (mock data, no backend needed), `app/analysis/[id]/` (stored result replay), `app/analytics/`
+- **Components**: `components/CompareForm.tsx`, `components/DiffDisplay.tsx`, `components/explorer/` (Explorer v2)
+- **Lib**: `lib/api-client.ts` (backend calls), `lib/risk-assessment.ts` (client-side risk signals), `lib/url-state.ts` (shareable URL state), `lib/types.ts`
+
+### Storage Plugin System
+Controlled by env vars `STORAGE_ENABLED` and `STORAGE_TYPE` (disk | postgres). The storage interface (`internal/storage/interface.go`) makes it easy to swap implementations.
+
+### Risk Assessment
+Risk signals (availability, security) are computed **client-side** in `lib/risk-assessment.ts` from the structured diff returned by the API. No risk logic lives in the backend.
+
+## Key Configuration
+
+**Backend** (`backend/.env.example`): `PORT`, `CORS_ALLOWED_ORIGINS`, `COMPARE_TIMEOUT`, `VERSIONS_TIMEOUT`, `INTERNAL_DIFF_ENABLED`, `STORAGE_ENABLED`, `STORAGE_TYPE`, `DATABASE_URL`
+
+**Frontend** (`frontend/.env.example`): Only `NEXT_PUBLIC_API_URL` (points to backend)
+
+## Testing
+
+- Backend tests use Go's built-in testing + testify; run with race detector in CI
+- Frontend unit/integration tests use Jest + React Testing Library
+- E2E tests use Playwright (`/frontend/e2e/`); require a running backend (disabled in CI by default)
+- CI runs backend and frontend test jobs independently based on path changes (`.github/workflows/ci.yml`)
+
+## Git Conventions
+
+- **Commits**: Conventional commits — `feat:`, `fix:`, `docs:`, `test:`, `refactor:`, `chore:`, `ci:`
+- **Branches**: `feature/`, `fix/`, `docs/`, `refactor/` prefixes
+- **Releases**: Git tags `v*.*.*` trigger the release workflow