feat: add monorepo configuration and shared packages structure

Root-level setup:
- package.json with Turborepo scripts
- pnpm-workspace.yaml for workspace management
- turbo.json for build pipeline
- Common config files (.nvmrc, .prettierrc, .editorconfig)

Shared packages (packages/):
- @manacore/shared-types - Common TypeScript types
- @manacore/shared-supabase - Unified Supabase client
- @manacore/shared-utils - Date, string, async utilities
- @manacore/shared-ui - React Native UI components (placeholder)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/shared-ui/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@manacore/shared-ui",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Shared React Native UI components for Manacore monorepo",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": "./src/index.ts"
+  },
+  "scripts": {
+    "type-check": "tsc --noEmit",
+    "clean": "rm -rf dist"
+  },
+  "peerDependencies": {
+    "react": ">=18.0.0",
+    "react-native": ">=0.70.0"
+  },
+  "devDependencies": {
+    "@types/react": "^18.3.0",
+    "typescript": "^5.9.2"
+  }
+}

packages/shared-ui/src/index.ts

@@ -0,0 +1,24 @@
+/**
+ * Shared React Native UI components for Manacore monorepo
+ *
+ * This package will contain common UI components used across all mobile apps.
+ *
+ * Planned components:
+ * - Button
+ * - Text
+ * - Input
+ * - Card
+ * - Modal
+ * - Loading indicators
+ * - Icons
+ */
+
+// Placeholder export until components are migrated
+export const SHARED_UI_VERSION = '0.1.0';
+
+// Future exports will include:
+// export { Button } from './components/Button';
+// export { Text } from './components/Text';
+// export { Input } from './components/Input';
+// export { Card } from './components/Card';
+// export { Modal } from './components/Modal';

packages/shared-ui/tsconfig.json

@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2020"],
+    "jsx": "react-native",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "declaration": true,
+    "declarationMap": true,
+    "outDir": "./dist"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist"]
+}