fix(web): restore ESLint, Prettier, and Husky code quality tools (#648)

## Problem
PR #647 accidentally removed all code quality tools when adding test dependencies:
- ❌ ESLint (9 packages) - code linting
- ❌ Prettier - code formatting
- ❌ Husky - Git hooks
- ❌ lint-staged - pre-commit checks
- ❌ Related scripts (lint, format, prepare)

This significantly impacts code quality and team collaboration.

## Root Cause
When adding test dependencies (vitest, @testing-library/react), the package.json
was incorrectly edited, removing all existing devDependencies.

## Solution
Restore all code quality tools while keeping the new test dependencies:

### ✅ Restored packages:
- @eslint/js
- @typescript-eslint/eslint-plugin
- @typescript-eslint/parser
- eslint + plugins (prettier, react, react-hooks, react-refresh)
- prettier
- husky
- lint-staged

### ✅ Kept test packages:
- @testing-library/jest-dom
- @testing-library/react
- jsdom
- vitest

### ✅ Restored scripts:
```json
{
  "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
  "lint:fix": "eslint . --ext ts,tsx --fix",
  "format": "prettier --write \"src/**/*.{ts,tsx,css,json}\"",
  "format:check": "prettier --check \"src/**/*.{ts,tsx,css,json}\"",
  "test": "vitest run",
  "prepare": "husky"
}
```

### ✅ Restored lint-staged config

## Impact
This fix restores:
- Automated code style enforcement
- Pre-commit quality checks
- Consistent code formatting
- Team collaboration standards

## Testing
- [x] npm install succeeds
- [x] npm run build succeeds
- [x] All scripts are functional

Related-To: PR #647

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

Co-authored-by: Claude <noreply@anthropic.com>

web/package.json

@@ -6,6 +6,11 @@
     "dev": "vite",
     "build": "tsc && vite build",
     "preview": "vite preview",
+    "lint": "eslint . --ext ts,tsx --report-unused-disable-directives --max-warnings 0",
+    "lint:fix": "eslint . --ext ts,tsx --fix",
+    "format": "prettier --write \"src/**/*.{ts,tsx,css,json}\"",
+    "format:check": "prettier --check \"src/**/*.{ts,tsx,css,json}\"",
+    "prepare": "husky",
     "test": "vitest run"
   },
   "dependencies": {
@@ -23,17 +28,38 @@
     "zustand": "^5.0.2"
   },
   "devDependencies": {
+    "@eslint/js": "^9.39.1",
     "@testing-library/jest-dom": "^6.9.1",
     "@testing-library/react": "^16.3.0",
     "@types/react": "^18.3.17",
     "@types/react-dom": "^18.3.5",
+    "@typescript-eslint/eslint-plugin": "^8.46.3",
+    "@typescript-eslint/parser": "^8.46.3",
     "@vitejs/plugin-react": "^4.3.4",
     "autoprefixer": "^10.4.20",
+    "eslint": "^9.39.1",
+    "eslint-config-prettier": "^10.1.8",
+    "eslint-plugin-prettier": "^5.5.4",
+    "eslint-plugin-react": "^7.37.5",
+    "eslint-plugin-react-hooks": "^7.0.1",
+    "eslint-plugin-react-refresh": "^0.4.24",
+    "husky": "^9.1.7",
     "jsdom": "^25.0.1",
+    "lint-staged": "^16.2.6",
     "postcss": "^8.4.49",
+    "prettier": "^3.6.2",
     "tailwindcss": "^3.4.17",
     "typescript": "^5.8.3",
     "vite": "^6.0.7",
     "vitest": "^2.1.9"
+  },
+  "lint-staged": {
+    "*.{ts,tsx}": [
+      "eslint --fix",
+      "prettier --write"
+    ],
+    "*.{css,json}": [
+      "prettier --write"
+    ]
   }
 }