feat: add basic webui

apps/email-playground/.gitignore

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+.react-email

apps/email-playground/emails/contact.tsx

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+import { ContactTemplate } from '@konobangu/email/templates/contact';
+
+const ExampleContactEmail = () => (
+  <ContactTemplate
+    name="Jane Smith"
+    email="jane.smith@example.com"
+    message="I'm interested in your services."
+  />
+);
+
+export default ExampleContactEmail;

apps/email-playground/package.json

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+{
+  "name": "email-playground",
+  "version": "0.0.0",
+  "private": true,
+  "scripts": {
+    "build": "email build",
+    "dev": "email dev --port 3003",
+    "export": "email export",
+    "clean": "git clean -xdf .cache .turbo dist node_modules",
+    "typecheck": "tsc --noEmit --emitDeclarationOnly false"
+  },
+  "dependencies": {
+    "@react-email/components": "0.0.31",
+    "@konobangu/email": "workspace:*",
+    "react": "^19.0.0",
+    "react-email": "3.0.4"
+  },
+  "devDependencies": {
+    "@konobangu/typescript-config": "workspace:*",
+    "@types/node": "22.10.1",
+    "@types/react": "19.0.1",
+    "typescript": "^5.7.2"
+  }
+}

apps/email-playground/tsconfig.json

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+{
+  "extends": "@konobangu/typescript-config/nextjs.json",
+  "include": ["**/*.ts", "**/*.tsx"],
+  "exclude": ["node_modules"]
+}