fix(ci): use generic simulator destination

macos-latest (Xcode 16.4) has no iPhone 16 simulator runtime pre-installed.
Use generic/platform=iOS Simulator to compile without a specific device.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: vveerrgg

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
             -project NostrKey.xcodeproj \
             -scheme NostrKey \
             -configuration Debug \
-            -destination 'platform=iOS Simulator,name=iPhone 16,OS=latest' \
+            -destination 'generic/platform=iOS Simulator' \
             CODE_SIGN_IDENTITY="" \
             CODE_SIGNING_REQUIRED=NO \
             CODE_SIGNING_ALLOWED=NO