Fix code review issues: improve cross-platform compatibility and reduce duplication

Co-authored-by: huangyiirene <7665279+huangyiirene@users.noreply.github.com>

Author: Copilot

.github/workflows/dependabot-auto-merge.yml

@@ -19,24 +19,32 @@ jobs:
         with:
           github-token: "${{ secrets.GITHUB_TOKEN }}"
 
+      - name: Check if auto-mergeable
+        id: check-update
+        run: |
+          UPDATE_TYPE="${{ steps.metadata.outputs.update-type }}"
+          if [[ "$UPDATE_TYPE" == "version-update:semver-patch" ]] || [[ "$UPDATE_TYPE" == "version-update:semver-minor" ]]; then
+            echo "auto_merge=true" >> $GITHUB_OUTPUT
+          else
+            echo "auto_merge=false" >> $GITHUB_OUTPUT
+          fi
+
       - name: Enable auto-merge for Dependabot PRs
-        # Auto-merge patch and minor updates
-        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor' }}
+        if: steps.check-update.outputs.auto_merge == 'true'
         run: gh pr merge --auto --squash "$PR_URL"
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Approve PR
-        # Auto-approve patch and minor updates
-        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-patch' || steps.metadata.outputs.update-type == 'version-update:semver-minor' }}
+        if: steps.check-update.outputs.auto_merge == 'true'
         run: gh pr review --approve "$PR_URL"
         env:
           PR_URL: ${{ github.event.pull_request.html_url }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Comment on major updates
-        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-major' }}
+        if: steps.metadata.outputs.update-type == 'version-update:semver-major'
         uses: actions/github-script@v7
         with:
           script: |

.github/workflows/size-check.yml

@@ -52,7 +52,8 @@ jobs:
               # Calculate sizes for main bundle files
               for file in "$pkg"/*.js; do
                 if [ -f "$file" ] && [ ! -f "${file}.map" ]; then
-                  size=$(stat -f%z "$file" 2>/dev/null || stat -c%s "$file" 2>/dev/null || echo "0")
+                  # Use portable method to get file size
+                  size=$(wc -c < "$file")
                   size_kb=$(awk "BEGIN {printf \"%.2f\", $size/1024}")
                   
                   # Estimate gzipped size