fix: use macos-13 runner for x86_64 build and add arch verification

macos-14 and macos-latest runners on GitHub Actions are Apple Silicon (arm64).
For Intel (x86_64) builds, macos-13 is required.

This caused filterGenerator-macos-x86_64.dmg to silently contain an arm64
binary, making it unrunnable on Intel Macs.

Also add explicit architecture verification steps to both macOS jobs so any
future runner/architecture mismatch will fail loudly with a clear error.

Author: wysaid

.github/workflows/macos-build.yml

@@ -63,6 +63,15 @@ jobs:
       - name: Build
         run: cmake --build build --config Release -j$(sysctl -n hw.logicalcpu)
 
+      - name: Verify architecture (arm64)
+        run: |
+          ARCH=$(lipo -info build/filterGenerator/filterGenerator.app/Contents/MacOS/filterGenerator | grep -o 'arm64\|x86_64' | tail -1)
+          echo "Binary architecture: $ARCH"
+          if [ "$ARCH" != "arm64" ]; then
+            echo "ERROR: Expected arm64 but got $ARCH"
+            exit 1
+          fi
+
       - name: Deploy Qt dependencies
         run: |
           macdeployqt build/filterGenerator/filterGenerator.app -verbose=1
@@ -92,7 +101,7 @@ jobs:
 
   build-mac-x86_64:
     name: macOS x86_64 (Intel)
-    runs-on: macos-14
+    runs-on: macos-13
     outputs:
       artifact-name: ${{ steps.set-artifact.outputs.name }}
 
@@ -125,6 +134,15 @@ jobs:
       - name: Build
         run: cmake --build build --config Release -j$(sysctl -n hw.logicalcpu)
 
+      - name: Verify architecture (x86_64)
+        run: |
+          ARCH=$(lipo -info build/filterGenerator/filterGenerator.app/Contents/MacOS/filterGenerator | grep -o 'arm64\|x86_64' | tail -1)
+          echo "Binary architecture: $ARCH"
+          if [ "$ARCH" != "x86_64" ]; then
+            echo "ERROR: Expected x86_64 but got $ARCH"
+            exit 1
+          fi
+
       - name: Deploy Qt dependencies
         run: |
           macdeployqt build/filterGenerator/filterGenerator.app -verbose=1