chore: migrate from npm to bun

- Replace package-lock.json with bun.lock
- Update CI workflows to use oven-sh/setup-bun@v2
- Update README with bun install instructions

Author: c4ffein

.github/workflows/lint.yml

@@ -13,14 +13,11 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - name: Setup Node.js
-      uses: actions/setup-node@v4
-      with:
-        node-version: '20'
-        cache: 'npm'
+    - name: Setup Bun
+      uses: oven-sh/setup-bun@v2
 
     - name: Install dependencies
-      run: npm ci
+      run: bun install
 
     - name: Check Prettier formatting
-      run: npm run format:check
+      run: bun run format:check

.github/workflows/playwright.yml

@@ -14,20 +14,17 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - name: Setup Node.js
-      uses: actions/setup-node@v4
-      with:
-        node-version: '20'
-        cache: 'npm'
+    - name: Setup Bun
+      uses: oven-sh/setup-bun@v2
 
     - name: Install dependencies
-      run: npm ci
+      run: bun install
 
     - name: Install Playwright Browsers
-      run: npx playwright install --with-deps chromium
+      run: bunx playwright install --with-deps chromium
 
     - name: Run Playwright tests
-      run: npm run test:e2e
+      run: bun run test:e2e
       env:
         CI: true