chore: add VS Code workspace config and improve CI infrastructure

Add .vscode/ with Biome formatter, Tailwind, Vitest, Playwright, and
Python debug configs. Extract shared pnpm/Node setup into a composite
GitHub Action and add Dependabot and dependency-review workflows.

.github/workflows/release.yml

@@ -22,17 +22,7 @@ jobs:
           fetch-depth: 0
           persist-credentials: false
 
-      - name: Setup pnpm
-        uses: pnpm/action-setup@v4
-
-      - name: Setup Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: 22
-          cache: pnpm
-
-      - name: Install dependencies
-        run: pnpm install --frozen-lockfile
+      - uses: ./.github/actions/setup
 
       - name: Run semantic-release
         env: