fix(ci): scope format check to only PR-changed files

.github/workflows/ci.yml

@@ -81,9 +81,19 @@ jobs:
       - name: Copy environment defaults
         run: cp .env.example .env
 
-      - name: Check formatting in affected workspaces
+      - name: Get changed files
+        id: changed
+        if: github.event_name == 'pull_request'
+        env:
+          BASE_REF: ${{ github.base_ref }}
+        run: |
+          git diff --name-only --diff-filter=ACMR "origin/${BASE_REF}...HEAD" -- '*.ts' '*.tsx' '*.js' '*.jsx' > /tmp/changed-files
+          echo "count=$(wc -l < /tmp/changed-files | tr -d '[:space:]')" >> $GITHUB_OUTPUT
+
+      - name: Check formatting on changed files
+        if: steps.changed.outputs.count != '0'
         continue-on-error: true
-        run: pnpm turbo run format --affected --continue -- --check
+        run: xargs -r -a /tmp/changed-files pnpm exec oxfmt --check
 
       - name: Lint, typecheck, and build affected workspaces
         run: pnpm turbo run lint typecheck build --affected --continue=dependencies-successful