chore: migrate linting to biome

Author: GhostTypes

CHANGELOG.md

@@ -39,7 +39,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Express 5 wildcard route compatibility** - Changed unnamed wildcards to named wildcards (`/*splat`)
 - **Local build scripts** - Corrected binary name from `yao-pkg` to `pkg`
 - **Missing index.html error handling** - Returns proper 500 server error with debugging context instead of misleading 404
-- **ESLint configuration** - Split configuration for backend (CommonJS) and frontend (ES modules) with appropriate tsconfig references
+- **Lint configuration** - Split configuration for backend (CommonJS) and frontend (ES modules) with appropriate tsconfig references
 - **404 error reporting** - Fixed catch-all route to use `req.originalUrl` instead of `req.path`
 - **Windows E2E process management**:
   - Use `taskkill /F /IM` and `tasklist /FI` for reliable process matching

CLAUDE.md

@@ -40,8 +40,10 @@ npm run build:all          # Build for all platforms
 
 ### Code Quality
 ```bash
-npm run lint           # Run ESLint on all TypeScript files
-npm run lint:fix       # Auto-fix ESLint issues
+npm run lint           # Run Biome lint checks
+npm run lint:fix       # Auto-fix Biome lint issues
+npm run format         # Preview Biome formatting changes
+npm run format:fix     # Apply Biome formatting changes
 npm run type-check     # TypeScript type checking without emit
 npm test               # Tests (not yet implemented)
 npm run clean          # Remove dist directory
@@ -169,7 +171,7 @@ Default config values are in `ConfigManager.ts`.
 - `lucide` - Icon library
 
 **Dev**:
-- TypeScript 5.7, ESLint 9 with TypeScript ESLint
+- TypeScript 5.7, Biome 2 for linting and formatting
 - `concurrently` - Parallel build tasks
 - `nodemon` - Dev server hot reload
 - `pkg` - Executable packaging

biome.json

@@ -0,0 +1,57 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.4.5/schema.json",
+  "vcs": {
+    "enabled": true,
+    "clientKind": "git",
+    "useIgnoreFile": true
+  },
+  "files": {
+    "ignoreUnknown": true,
+    "includes": [
+      "**",
+      "!!**/dist",
+      "!!**/node_modules",
+      "!!**/build",
+      "!!**/out",
+      "!!.dependencies",
+      "!!coverage",
+      "!!FlashForgeUI-Electron"
+    ]
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 100,
+    "lineEnding": "lf"
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true,
+      "style": {
+        "useNodejsImportProtocol": "off"
+      },
+      "suspicious": {
+        "noExplicitAny": "warn"
+      }
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single",
+      "jsxQuoteStyle": "double",
+      "semicolons": "always",
+      "trailingCommas": "es5",
+      "arrowParentheses": "always"
+    }
+  },
+  "assist": {
+    "enabled": true,
+    "actions": {
+      "source": {
+        "organizeImports": "on"
+      }
+    }
+  }
+}