feat: add node help system and registry for extensible node types

- Implemented a help system for different node types (config, render, variable, function) with detailed usage instructions.
- Created a node registry to manage node types, including registration, retrieval, and validation of connections between nodes.
- Defined central node and edge types for the application to streamline state management.
- Added Nunjucks autocomplete functionality to enhance user experience in template editing.
- Developed a syntax highlighting parser for PlantUML and Nunjucks within the CodeMirror editor.
- Registered built-in node types at application startup, including their default configurations and help entries.
- Introduced a theme context provider to manage light/dark mode preferences across the application.
- Created utility functions for class name management using clsx and tailwind-merge.
- Set up Tailwind CSS for styling with custom themes and responsive design.
- Configured Vite for development with proxy settings for backend API calls and Kroki diagram service.

.dockerignore

@@ -0,0 +1,24 @@
+# Monorepo: each service builds from its own context (frontend/, backend/).
+# This file applies to root-level builds only.
+node_modules
+**/node_modules
+dist
+**/dist
+.git
+.gitignore
+*.md
+.env*
+.env.*
+!.env.example
+.idea
+.vscode
+*.log
+.DS_Store
+Thumbs.db
+**/__tests__
+**/*.test.ts
+**/*.test.tsx
+**/*.spec.ts
+**/*.spec.tsx
+coverage
+.nyc_output

.gitignore

@@ -1,5 +1,6 @@
 # dependencies
-/node_modules
+node_modules
+
 /.pnp
 .pnp.js
 
@@ -9,14 +10,15 @@
 # production build
 /build
 /dist
+frontend/dist
+
+# environment (keep .env.example if you add one)
+.env
+.env.*
+!.env.example
 
 # misc
 .DS_Store
-.env
-.env.local
-.env.development.local
-.env.test.local
-.env.production.local
 
 # logs
 npm-debug.log*
@@ -38,3 +40,7 @@ Thumbs.db
 .cache
 .parcel-cache
 
+# Docker (optional local overrides)
+docker-compose.override.yml
+docker-compose.override.yaml
+

.vite/deps/_metadata.json

@@ -0,0 +1,8 @@
+{
+  "hash": "dba24d0a",
+  "configHash": "beca0bba",
+  "lockfileHash": "85459ac0",
+  "browserHash": "3fd5087e",
+  "optimized": {},
+  "chunks": {}
+}

.vite/deps/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}

README.md

@@ -0,0 +1,99 @@
+# Zui
+
+Node-based editor (React Flow) for configs, variables, and rendering (PlantUML, Markdown, etc.). Optional Node.js backend API for demos or future features (e.g. todos CRUD).
+
+## Project layout
+
+```
+my-app/
+├── frontend/           # React app (Vite, TypeScript)
+│   ├── Dockerfile      # Multi-stage for prod (build → Nginx)
+│   ├── Dockerfile.dev  # Dev with hot reload
+│   ├── src/
+│   ├── public/
+│   ├── nginx.conf
+│   └── package.json
+├── backend/            # Node.js/Express API
+│   ├── Dockerfile
+│   ├── src/
+│   │   └── index.js
+│   └── package.json
+├── docker-compose.yml
+├── .dockerignore
+└── .gitignore
+```
+
+Ignored by git: `node_modules`, `dist`, `.env`, `.env.*` (see [.gitignore](.gitignore)). Local Docker overrides: `docker-compose.override.yml` (optional, not committed).
+
+---
+
+## Run locally (dev)
+
+**Frontend only:**
+
+```bash
+cd frontend && npm install && npm run dev
+# → http://localhost:3000
+```
+
+**Frontend + backend** (so the app can show “Backend API: N todos”):
+
+```bash
+# Terminal 1 – backend
+cd backend && npm install && npm run dev
+# → http://localhost:8080
+
+# Terminal 2 – frontend
+cd frontend && npm install && npm run dev
+# → http://localhost:3000 (Vite proxies /api/todos to backend)
+```
+
+---
+
+## Run with Docker
+
+```bash
+docker compose up --build
+```
+
+- **Frontend**: http://localhost:3000 (Nginx; `/api/*` proxied to backend).
+- **Backend**: http://localhost:8080 (Express).
+
+Environment variables (backend service):
+
+| Variable     | Default                    | Description |
+|-------------|----------------------------|-------------|
+| `PORT`      | `8080`                     | Backend listen port. |
+| `CORS_ORIGIN` | `http://localhost:3000`  | Allowed origin for CORS. |
+
+For self-hosting (e.g. Tailscale/HTTPS): set `CORS_ORIGIN` to your frontend URL; put Caddy or Nginx in front for TLS if needed.
+
+**Dev with Docker (frontend hot reload):** use `frontend/Dockerfile.dev` and mount `./frontend` as a volume, or run `cd frontend && npm run dev` locally.
+
+---
+
+## Scripts
+
+| Command | Description |
+|--------|-------------|
+| `cd frontend && npm run dev` | Vite dev server. |
+| `cd frontend && npm run build` | Build frontend for production. |
+| `cd frontend && npm run preview` | Preview production build. |
+| `cd backend && npm run dev` | Backend with `--watch`. |
+| `cd backend && npm start` | Backend production run. |
+| `docker compose up --build` | Run frontend + backend in Docker. |
+
+---
+
+## Backend API (no DB)
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET    | `/api/todos`     | List all todos. |
+| GET    | `/api/todos/:id` | Get one todo. |
+| POST   | `/api/todos`     | Create (`{ "title": "...", "completed": false }`). |
+| PUT    | `/api/todos/:id` | Update. |
+| DELETE | `/api/todos/:id` | Delete. |
+| GET    | `/health`        | Health check (e.g. for Docker). |
+
+Data is in-memory (resets on restart). Add a JSON file or DB later if needed.

backend/.dockerignore

@@ -0,0 +1,5 @@
+node_modules
+.git
+*.log
+.env*
+.env.*

backend/Dockerfile

@@ -0,0 +1,21 @@
+# Single-stage, Alpine, Node 20. Production backend (no DB).
+FROM node:20-alpine
+
+WORKDIR /app
+
+# Dependencies only
+COPY package.json package-lock.json* ./
+RUN npm ci --omit=dev
+
+COPY src ./src
+
+# Non-root user
+RUN addgroup -g 1001 -S app && adduser -u 1001 -S app -G app
+USER app
+
+EXPOSE 8080
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD node -e "require('http').get('http://localhost:8080/health', (r) => process.exit(r.statusCode === 200 ? 0 : 1))"
+
+CMD ["node", "src/index.js"]

backend/package-lock.json

@@ -0,0 +1,857 @@
+{
+  "name": "zui-backend",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "zui-backend",
+      "version": "1.0.0",
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+        "express": "^4.21.0"
+      },
+      "engines": {
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+      }
+    },
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+      "license": "MIT",
+      "dependencies": {
+        "mime-types": "~2.1.34",
+        "negotiator": "0.6.3"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/array-flatten": {
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+      "license": "MIT"
+    },
+    "node_modules/body-parser": {
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+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.4.tgz",
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-weakmap": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/side-channel-weakmap/-/side-channel-weakmap-1.0.2.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.5",
+        "object-inspect": "^1.13.3",
+        "side-channel-map": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
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+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
+      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/toidentifier": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.6"
+      }
+    },
+    "node_modules/type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      },
+      "engines": {
+        "node": ">= 0.6"
+      }
+    },
+    "node_modules/unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha512-pjy2bYhSsufwWlKwPc+l3cN7+wuJlK6uz0YdJEOlQDbl6jo/YlPi4mb8agUkVC8BF7V8NuzeyPNqRksA3hztKQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha512-pMZTvIkT1d+TFGvDOqodOclx0QWkkgi6Tdoa8gC8ffGAAqz9pzPTZWAybbsHHoED/ztMtkv/VoYTYyShUn81hA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8"
+      }
+    }
+  }
+}

backend/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "zui-backend",
+  "version": "1.0.0",
+  "private": true,
+  "description": "Minimal Express API for Zui (todos CRUD, no DB)",
+  "main": "src/index.js",
+  "scripts": {
+    "start": "node src/index.js",
+    "dev": "node --watch src/index.js"
+  },
+  "engines": {
+    "node": ">=20"
+  },
+  "dependencies": {
+    "cors": "^2.8.5",
+    "express": "^4.21.0"
+  }
+}

backend/src/index.js

@@ -0,0 +1,90 @@
+/**
+ * Minimal Express API: /api/todos CRUD (in-memory).
+ * No DB, no auth. CORS allowed for frontend. Production-ready env (PORT, CORS_ORIGIN).
+ */
+
+const express = require('express')
+const cors = require('cors')
+
+const PORT = Number(process.env.PORT) || 8080
+const CORS_ORIGIN = process.env.CORS_ORIGIN || 'http://localhost:3000'
+
+const app = express()
+
+app.use(cors({ origin: CORS_ORIGIN }))
+app.use(express.json())
+
+// In-memory store (replace with JSON file or DB later)
+let todos = [
+  { id: '1', title: 'Sample todo', completed: false },
+  { id: '2', title: 'Another item', completed: true },
+]
+let nextId = 3
+
+/** GET /api/todos — list all */
+app.get('/api/todos', (req, res) => {
+  try {
+    res.json(todos)
+  } catch (err) {
+    res.status(500).json({ error: err.message })
+  }
+})
+
+/** GET /api/todos/:id — get one */
+app.get('/api/todos/:id', (req, res) => {
+  try {
+    const todo = todos.find((t) => t.id === req.params.id)
+    if (!todo) return res.status(404).json({ error: 'Not found' })
+    res.json(todo)
+  } catch (err) {
+    res.status(500).json({ error: err.message })
+  }
+})
+
+/** POST /api/todos — create */
+app.post('/api/todos', (req, res) => {
+  try {
+    const { title, completed } = req.body ?? {}
+    const id = String(nextId++)
+    const todo = { id, title: title ?? '', completed: Boolean(completed) }
+    todos.push(todo)
+    res.status(201).json(todo)
+  } catch (err) {
+    res.status(500).json({ error: err.message })
+  }
+})
+
+/** PUT /api/todos/:id — update */
+app.put('/api/todos/:id', (req, res) => {
+  try {
+    const idx = todos.findIndex((t) => t.id === req.params.id)
+    if (idx === -1) return res.status(404).json({ error: 'Not found' })
+    const { title, completed } = req.body ?? {}
+    if (title !== undefined) todos[idx].title = title
+    if (completed !== undefined) todos[idx].completed = Boolean(completed)
+    res.json(todos[idx])
+  } catch (err) {
+    res.status(500).json({ error: err.message })
+  }
+})
+
+/** DELETE /api/todos/:id — delete */
+app.delete('/api/todos/:id', (req, res) => {
+  try {
+    const idx = todos.findIndex((t) => t.id === req.params.id)
+    if (idx === -1) return res.status(404).json({ error: 'Not found' })
+    const removed = todos.splice(idx, 1)[0]
+    res.json(removed)
+  } catch (err) {
+    res.status(500).json({ error: err.message })
+  }
+})
+
+/** Health check for Docker / orchestration */
+app.get('/health', (req, res) => {
+  res.status(200).json({ ok: true })
+})
+
+app.listen(PORT, '0.0.0.0', () => {
+  console.log(`Backend listening on port ${PORT} (CORS: ${CORS_ORIGIN})`)
+})

docker-compose.yml

@@ -0,0 +1,40 @@
+# Zui: frontend (Nginx) + backend (Express). No DB.
+# Usage: docker compose up --build
+# Dev with hot reload: use frontend/Dockerfile.dev and mount ./frontend, or run npm run dev locally.
+
+services:
+  frontend:
+    build:
+      context: ./frontend
+      dockerfile: Dockerfile
+    ports:
+      - "3000:80"
+    depends_on:
+      backend:
+        condition: service_healthy
+    environment:
+      - VITE_API_URL=http://localhost:8080
+    networks:
+      - app
+
+  backend:
+    build:
+      context: ./backend
+      dockerfile: Dockerfile
+    ports:
+      - "8080:8080"
+    environment:
+      - PORT=8080
+      - CORS_ORIGIN=http://localhost:3000
+    healthcheck:
+      test: ["CMD", "node", "-e", "require('http').get('http://localhost:8080/health', (r) => process.exit(r.statusCode === 200 ? 0 : 1))"]
+      interval: 30s
+      timeout: 3s
+      start_period: 5s
+      retries: 3
+    networks:
+      - app
+
+networks:
+  app:
+    driver: bridge

frontend/.dockerignore

@@ -0,0 +1,26 @@
+# Dependencies and build output
+node_modules
+dist
+
+# Git and env
+.git
+.gitignore
+.env*
+!.env.example
+
+# IDE, OS, logs
+.idea
+.vscode
+*.log
+.DS_Store
+
+# Tests (keep image small)
+**/__tests__
+**/*.test.ts
+**/*.test.tsx
+**/*.spec.ts
+**/*.spec.tsx
+coverage
+
+# Dev Dockerfile not needed in prod image
+Dockerfile.dev

frontend/Dockerfile

@@ -0,0 +1,21 @@
+# Multi-stage: build Vite app, then serve with Nginx (Alpine).
+# Frontend only; backend is a separate service.
+
+# Stage 1: build
+FROM node:20-alpine AS builder
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+COPY . .
+RUN npm run build
+
+# Stage 2: serve
+FROM nginx:alpine
+COPY --from=builder /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD wget -q -O /dev/null http://localhost:80/ || exit 1
+CMD ["nginx", "-g", "daemon off;"]

frontend/Dockerfile.dev

@@ -0,0 +1,12 @@
+# Dev image: run Vite with hot reload. Mount source as volume.
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package.json package-lock.json* ./
+RUN npm ci
+
+# App code is mounted; no COPY so edits trigger reload
+EXPOSE 3000
+
+CMD ["npm", "run", "dev", "--", "--host", "0.0.0.0"]

frontend/nginx.conf

@@ -0,0 +1,19 @@
+# Serve SPA and proxy /api to backend (Docker Compose).
+server {
+    listen 80;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    location /api/ {
+        proxy_pass http://backend:8080/api/;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}

frontend/src/App.tsx

@@ -155,6 +155,17 @@ export default function App() {
   const nodesRef = React.useRef(nodes)
   nodesRef.current = nodes
 
+  // Example backend API fetch (dev proxy or Docker nginx → backend)
+  const [apiTodosCount, setApiTodosCount] = React.useState<number | null>(null)
+  React.useEffect(() => {
+    fetch('/api/todos')
+      .then((r) => r.json())
+      .then((data: unknown) => {
+        if (Array.isArray(data)) setApiTodosCount(data.length)
+      })
+      .catch(() => setApiTodosCount(-1))
+  }, [])
+
   // Throttle node changes during drag: merge changes and flush at most once per animation frame to reduce re-renders
   const pendingChangesRef = useRef<NodeChange<Node>[]>([])
   const rafRef = useRef<number | null>(null)
@@ -489,6 +500,11 @@ export default function App() {
         canRedo={canRedo}
         onFitView={() => flowActionsRef.current?.fitView?.()}
       />
+      {apiTodosCount !== null && (
+        <div className="shrink-0 px-3 py-1 text-xs text-muted-foreground border-b border-border/50">
+          Backend API: {apiTodosCount >= 0 ? `${apiTodosCount} todos` : 'unavailable'}
+        </div>
+      )}
       {projectMessage && (
         <div
           role="status"

frontend/vite.config.ts

@@ -7,7 +7,20 @@ export default defineConfig({
   plugins: [react()],
   server: {
     proxy: {
-      // Avoid CORS: browser calls same origin, Vite forwards to Kroki
+      // Backend API (dev): proxy to avoid CORS
+      '/api/todos': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
+      },
+      '/api/todos/': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
+      },
+      '/health': {
+        target: 'http://localhost:8080',
+        changeOrigin: true,
+      },
+      // Kroki diagram service
       '/api/kroki': {
         target: 'https://kroki.io',
         changeOrigin: true,