Build Your Own Newsletter Tool

Build me a newsletter/email marketing tool with the following specifications:

## Tech Stack
- Next.js 14 with App Router
- Prisma with PostgreSQL
- Resend for email sending
- React Email for templates
- Tailwind CSS + shadcn/ui

## Core Features

### 1. Subscriber Management
- Import subscribers from CSV
- Add individual subscribers
- Subscriber fields: email, name, status, tags, subscribedAt
- Unsubscribe handling
- Search and filter subscribers

### 2. Email Campaigns
- Create new campaign (subject, content)
- Rich text editor with formatting
- Preview email before sending
- Schedule for later or send now
- Draft saving

### 3. Email Templates
- Create reusable templates
- Template variables ({{name}}, {{unsubscribe_link}})
- Preview with sample data

### 4. Sending
- Integration with Resend API
- Batch sending (respect rate limits)
- Track send status
- Handle bounces

### 5. Analytics
- Open rate tracking (via pixel)
- Click tracking (via redirect)
- Campaign performance dashboard
- Subscriber growth chart

### 6. Compliance
- Automatic unsubscribe link
- Physical address in footer
- Double opt-in option

## Database Schema
```prisma
model Subscriber {
  id           String   @id @default(cuid())
  email        String   @unique
  name         String?
  status       String   @default("active") // active, unsubscribed, bounced
  tags         String[]
  subscribedAt DateTime @default(now())
  sends        EmailSend[]
}

model Campaign {
  id          String   @id @default(cuid())
  subject     String
  content     String
  status      String   @default("draft") // draft, scheduled, sending, sent
  scheduledAt DateTime?
  sentAt      DateTime?
  sends       EmailSend[]
  createdAt   DateTime @default(now())
}

model EmailSend {
  id           String     @id @default(cuid())
  campaignId   String
  campaign     Campaign   @relation(fields: [campaignId], references: [id])
  subscriberId String
  subscriber   Subscriber @relation(fields: [subscriberId], references: [id])
  status       String     @default("pending")
  openedAt     DateTime?
  clickedAt    DateTime?
  sentAt       DateTime?
}
```

## Important: Use Resend for sending
```typescript
import { Resend } from 'resend';
const resend = new Resend(process.env.RESEND_API_KEY);

// Send in batches to respect rate limits
```

Please generate all files for a working newsletter tool.