fix: address all Copilot review comments

- Add error handling for grep commands with validation
- Validate version code is a valid number before comparison
- Remove duplicate version code extraction logic
- Fix tag exists exit code to use output variables instead

All 4 new Copilot comments have been addressed with proper error handling

Author: graycreate

.github/workflows/release.yml

@@ -54,9 +54,24 @@ jobs:
       id: check_version
       if: github.event_name == 'push'
       run: |
-        # Get current version from config.gradle
-        CURRENT_VERSION=$(grep versionName config.gradle | sed -E 's/.*versionName:\s*"([^"]+)".*/\1/')
-        CURRENT_CODE=$(grep versionCode config.gradle | sed -E 's/.*versionCode:\s*([0-9]+).*/\1/')
+        # Get current version from config.gradle with error handling
+        CURRENT_VERSION=$(grep versionName config.gradle | sed -E 's/.*versionName:\s*"([^"]+)".*/\1/' || echo "")
+        CURRENT_CODE=$(grep versionCode config.gradle | sed -E 's/.*versionCode:\s*([0-9]+).*/\1/' || echo "")
+        
+        # Validate extraction was successful
+        if [ -z "$CURRENT_VERSION" ] || [ -z "$CURRENT_CODE" ]; then
+          echo "❌ Error: Failed to extract version information from config.gradle"
+          echo "CURRENT_VERSION='$CURRENT_VERSION', CURRENT_CODE='$CURRENT_CODE'"
+          echo "should_release=false" >> $GITHUB_OUTPUT
+          exit 1
+        fi
+        
+        # Validate CURRENT_CODE is a valid number
+        if ! [[ "$CURRENT_CODE" =~ ^[0-9]+$ ]]; then
+          echo "❌ Error: Version code is not a valid number: $CURRENT_CODE"
+          echo "should_release=false" >> $GITHUB_OUTPUT
+          exit 1
+        fi
         
         # Get previous version - handle first commit case
         if git rev-parse HEAD~1 >/dev/null 2>&1; then
@@ -75,11 +90,16 @@ jobs:
           PREV_CODE="0"
         fi
         
+        # Validate PREV_CODE is a valid number (default to 0 if not)
+        if ! [[ "$PREV_CODE" =~ ^[0-9]+$ ]]; then
+          PREV_CODE="0"
+        fi
+        
         echo "Previous: v$PREV_VERSION (code: $PREV_CODE)"
         echo "Current: v$CURRENT_VERSION (code: $CURRENT_CODE)"
         
         # Check if version increased
-        if [ -n "$CURRENT_VERSION" ] && [ "$CURRENT_CODE" -gt "$PREV_CODE" ]; then
+        if [ "$CURRENT_CODE" -gt "$PREV_CODE" ]; then
           echo "✅ Version increased from $PREV_VERSION to $CURRENT_VERSION"
           echo "should_release=true" >> $GITHUB_OUTPUT
           echo "version=v$CURRENT_VERSION" >> $GITHUB_OUTPUT
@@ -108,30 +128,39 @@ jobs:
     - name: Extract version code
       id: version_info
       run: |
-        # Extract version code from config.gradle
-        VERSION_CODE=$(grep "versionCode:" config.gradle | sed -E 's/.*versionCode:\s*([0-9]+).*/\1/')
+        # Use version code from check_version step if available, otherwise extract it
+        if [ -n "${{ steps.check_version.outputs.version_code }}" ]; then
+          VERSION_CODE="${{ steps.check_version.outputs.version_code }}"
+        else
+          # Only extract if not already available (for workflow_dispatch)
+          VERSION_CODE=$(grep "versionCode:" config.gradle | sed -E 's/.*versionCode:\s*([0-9]+).*/\1/')
+        fi
         echo "version_code=$VERSION_CODE" >> $GITHUB_OUTPUT
         echo "Version Code: $VERSION_CODE"
         
     - name: Create and push tag
       if: steps.check_version.outputs.should_release == 'true' && github.event_name == 'push'
+      id: create_tag
       run: |
         TAG_NAME="${{ steps.version.outputs.version }}"
         
         # Check if tag already exists
         if git ls-remote --tags origin | grep -q "refs/tags/${TAG_NAME}$"; then
-          echo "⚠️ Tag $TAG_NAME already exists"
-          exit 0
+          echo "⚠️ Tag $TAG_NAME already exists, skipping tag creation"
+          echo "tag_created=false" >> $GITHUB_OUTPUT
+          echo "tag_exists=true" >> $GITHUB_OUTPUT
+        else
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          
+          # Create annotated tag
+          git tag -a "${TAG_NAME}" -m "Release ${TAG_NAME} (version code: ${{ steps.version_info.outputs.version_code }})"
+          git push origin "${TAG_NAME}"
+          
+          echo "🏷️ Created and pushed tag: ${TAG_NAME}"
+          echo "tag_created=true" >> $GITHUB_OUTPUT
+          echo "tag_exists=false" >> $GITHUB_OUTPUT
         fi
-        
-        git config user.name "github-actions[bot]"
-        git config user.email "github-actions[bot]@users.noreply.github.com"
-        
-        # Create annotated tag
-        git tag -a "${TAG_NAME}" -m "Release ${TAG_NAME} (version code: ${{ steps.version_info.outputs.version_code }})"
-        git push origin "${TAG_NAME}"
-        
-        echo "🏷️ Created and pushed tag: ${TAG_NAME}"
 
   build-apk:
     name: Build Release APK