Modernize project structure and configuration with Next.js 15, React Testing Library, and development tooling

.eslintrc.json

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+{
+  "extends": ["next/core-web-vitals"],
+  "rules": {
+    "react/no-unescaped-entities": "off"
+  }
+}

.github/workflows/ci.yml

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+name: CI/CD Pipeline
+
+on:
+  push:
+    branches: [ main, develop ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v4
+      with:
+        node-version: ${{ matrix.node-version }}
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run type checking
+      run: npm run type-check
+
+    - name: Run linting
+      run: npm run lint
+
+    - name: Run tests
+      run: npm test -- --coverage --watchAll=false
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        file: ./coverage/lcov.info
+        flags: unittests
+        name: codecov-umbrella
+
+  build:
+    runs-on: ubuntu-latest
+    needs: test
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Use Node.js 20.x
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20.x
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Build application
+      run: npm run build
+
+    - name: Upload build artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        name: build-files
+        path: .next/
+
+  lighthouse:
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.event_name == 'pull_request'
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Use Node.js 20.x
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20.x
+        cache: 'npm'
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Build application
+      run: npm run build
+
+    - name: Serve and run Lighthouse
+      run: |
+        npm install -g @lhci/cli
+        npm start &
+        sleep 10
+        lhci autorun
+      env:
+        LHCI_GITHUB_APP_TOKEN: ${{ secrets.LHCI_GITHUB_APP_TOKEN }}
+
+  security:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Run security audit
+      run: npm audit --audit-level high
+
+    - name: Run Snyk security check
+      uses: snyk/actions/node@master
+      env:
+        SNYK_TOKEN: ${{ secrets.SNYK_TOKEN }}
+      with:
+        args: --severity-threshold=high

.husky/pre-commit

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+#!/usr/bin/env sh
+. "$(dirname -- "$0")/_/husky.sh"
+
+npx lint-staged

.prettierignore

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+# Prettier ignore file
+node_modules/
+.next/
+.vercel/
+.git/
+dist/
+build/
+coverage/
+*.log
+*.lock
+package-lock.json
+yarn.lock
+pnpm-lock.yaml
+
+# Binary files
+*.jpg
+*.jpeg
+*.png
+*.gif
+*.ico
+*.svg
+*.woff
+*.woff2
+*.ttf
+*.eot
+
+# Ignore generated files
+*.min.js
+*.min.css

.prettierrc

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+{
+  "semi": true,
+  "trailingComma": "es5",
+  "singleQuote": true,
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "bracketSpacing": true,
+  "bracketSameLine": false,
+  "arrowParens": "avoid",
+  "endOfLine": "lf",
+  "quoteProps": "as-needed",
+  "jsxSingleQuote": false,
+  "embeddedLanguageFormatting": "auto"
+}