fix(ci): migrate CI workflow to Bun

Author: miccy

.github/workflows/ci.yaml

@@ -20,11 +20,16 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - name: Setup
-        uses: ./.github/actions/setup-node-pnpm-install
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: bun install
 
       - name: Install Playwright browsers
-        run: npx playwright install --with-deps
+        run: bun x playwright install --with-deps
 
       - name: Verify
-        run: pnpm verify
+        run: bun run verify