fix(ci): set Xcode 16.4 to resolve SDK issues

- Add maxim-lobanov/setup-xcode@v1 action to all iOS CI jobs
- Set xcode-version to '16.4' (latest stable on macOS-15 runners)
- Fixes "iOS 18.0 Platform Not Installed" build failures
- Ensures predictable iOS SDK environment across workflows
- Updated workflows:
  * build.yml (ios job)
  * firebase-release.yml (distribute-ios job)
  * pre-release.yml (build-ios-prod, deploy-app-store jobs)

Author: olgahaha

.github/workflows/build.yml

@@ -61,6 +61,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Setup Xcode
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '16.4'
+
       - name: Use Node.js
         uses: actions/setup-node@v4
         with:

.github/workflows/firebase-release.yml

@@ -91,6 +91,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Setup Xcode
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '16.4'
+
       - uses: actions/setup-node@v4
         with:
           node-version: '20.11.1'

.github/workflows/pre-release.yml

@@ -176,6 +176,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Setup Xcode
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '16.4'
+
       - uses: actions/setup-node@v4
         with:
           node-version: '20.11.1'
@@ -264,6 +269,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Setup Xcode
+        uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: '16.4'
+
       - name: Download IPA
         uses: actions/download-artifact@v4
         with: