feat: initialize monorepo with CLI, parser, and UI workspaces

.gitignore

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+node_modules/
+dist/
+*.tsbuildinfo
+.DS_Store
+*.local

package.json

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+{
+  "name": "diffity",
+  "version": "0.1.0",
+  "private": true,
+  "description": "GitHub-style git diff viewer in the browser",
+  "workspaces": [
+    "packages/cli",
+    "packages/parser",
+    "packages/ui"
+  ],
+  "scripts": {
+    "build": "npm run build -w packages/parser && npm run build -w packages/ui && npm run build -w packages/cli",
+    "test": "npm run test -w packages/parser",
+    "dev": "npm run dev -w packages/ui"
+  },
+  "keywords": ["git", "diff", "viewer", "cli"],
+  "author": "",
+  "license": "PolyForm-Shield-1.0.0"
+}

packages/cli/package.json

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+{
+  "name": "diffity",
+  "version": "0.1.0",
+  "type": "module",
+  "bin": {
+    "diffity": "./dist/index.js"
+  },
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "dev": "tsx src/index.ts"
+  },
+  "dependencies": {
+    "@diffity/parser": "0.1.0",
+    "commander": "latest",
+    "open": "latest",
+    "picocolors": "latest"
+  },
+  "files": [
+    "dist"
+  ],
+  "devDependencies": {
+    "tsx": "^4.21.0",
+    "typescript": "^5.9.3"
+  }
+}

packages/cli/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "composite": true
+  },
+  "include": ["src/**/*.ts"],
+  "references": [
+    { "path": "../parser" }
+  ]
+}

packages/parser/package.json

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+{
+  "name": "@diffity/parser",
+  "version": "0.1.0",
+  "type": "module",
+  "main": "./dist/index.js",
+  "types": "./dist/index.d.ts",
+  "exports": {
+    ".": {
+      "import": "./dist/index.js",
+      "types": "./dist/index.d.ts"
+    }
+  },
+  "scripts": {
+    "build": "tsc",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "files": [
+    "dist"
+  ],
+  "devDependencies": {
+    "typescript": "^5.9.3",
+    "vitest": "^4.1.0"
+  }
+}

packages/parser/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "composite": true
+  },
+  "include": ["src/**/*.ts"],
+  "exclude": ["src/__tests__", "src/__fixtures__"]
+}

packages/ui/package.json

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+{
+  "name": "@diffity/ui",
+  "version": "0.1.0",
+  "type": "module",
+  "private": true,
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "react": "latest",
+    "react-dom": "latest"
+  },
+  "devDependencies": {
+    "@types/react": "latest",
+    "@types/react-dom": "latest",
+    "@vitejs/plugin-react": "latest",
+    "typescript": "latest",
+    "vite": "latest"
+  }
+}

packages/ui/tsconfig.json

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+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src",
+    "composite": true,
+    "jsx": "react-jsx",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"]
+  },
+  "include": ["src/**/*.ts", "src/**/*.tsx"],
+  "references": [
+    { "path": "../parser" }
+  ]
+}

tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true
+  },
+  "references": [
+    { "path": "./packages/parser" },
+    { "path": "./packages/cli" },
+    { "path": "./packages/ui" }
+  ]
+}