fix(ios): align Flutter to 3.19.3 and pin Firebase pods to 10.29 to match project code

.github/workflows/build-ios.yaml

@@ -13,7 +13,7 @@ on:
 jobs:
   build-ios:
     name: Build iOS IPA
-    runs-on: macos-15
+    runs-on: macos-14
     if: github.server_url == 'https://github.com'
 
     steps:
@@ -22,13 +22,13 @@ jobs:
 
       - name: Select Xcode Version
         run: |
-          sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
+          sudo xcode-select -s /Applications/Xcode_15.4.app || sudo xcode-select -s /Applications/Xcode.app
           xcodebuild -version
 
       - name: Set up Flutter
         uses: subosito/flutter-action@v2
         with:
-          channel: 'stable'
+          flutter-version: '3.19.3'
           cache: true
 
       - name: Inspect Environment