fix(ios): restore simulator Rust build outputs (#15190)

- sync the iOS ATT pod lockfile with the Capacitor plugin version
already referenced by the repo
- make `xc-universal-binary.sh` produce a real universal simulator Rust
archive for `arm64` and `x86_64`
- run `uniffi-bindgen` against a single-slice archive before assembling
the fat simulator output

- [x] `bash -n packages/frontend/apps/ios/App/xc-universal-binary.sh`
- [x] `xcodebuild -workspace \"App.xcworkspace\" -scheme App
-destination 'generic/platform=iOS Simulator' -derivedDataPath
\".derivedData-rebuild\" build`

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

* **Bug Fixes**
* Improved the iOS build process so universal binaries are generated
from consistent output locations, reducing build path issues.
* Made device and simulator library handling more reliable during
packaging and code generation, helping produce the expected app binaries
more consistently.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/apps/ios/App/Podfile.lock

@@ -10,7 +10,7 @@ PODS:
     - Capacitor
   - CapacitorKeyboard (7.0.4):
     - Capacitor
-  - CapacitorPluginAppTrackingTransparency (2.0.5):
+  - CapacitorPluginAppTrackingTransparency (3.0.0):
     - Capacitor
   - CryptoSwift (1.8.3)
 
@@ -51,7 +51,7 @@ SPEC CHECKSUMS:
   CapacitorCordova: 31bbe4466000c6b86d9b7f1181ee286cff0205aa
   CapacitorHaptics: ce15be8f287fa2c61c7d2d9e958885b90cf0bebc
   CapacitorKeyboard: 5660c760113bfa48962817a785879373cf5339c3
-  CapacitorPluginAppTrackingTransparency: 92ae9c1cfb5cf477753db9269689332a686f675a
+  CapacitorPluginAppTrackingTransparency: f0df8fe65d07d3854de3dad832caf192262bbaa5
   CryptoSwift: 967f37cea5a3294d9cce358f78861652155be483
 
 PODFILE CHECKSUM: 2c1e4be82121f2d9724ecf7e31dd14e165aeb082

packages/frontend/apps/ios/App/xc-universal-binary.sh

@@ -41,14 +41,16 @@ fi
 FFI_TARGET=${1}
 # path to source code root
 SRC_ROOT=${2}
+# Keep Cargo artifacts in a stable location that the rest of this script can reference.
+export CARGO_TARGET_DIR="${CARGO_TARGET_DIR:-$SRC_ROOT/../../../target}"
 # buildvariant from our xcconfigs
 BUILDVARIANT=$(echo "${3}" | tr '[:upper:]' '[:lower:]')
 
-RELFLAG=
+RELFLAG=debug
+CARGO_PROFILE_FLAG=
 if [[ "${BUILDVARIANT}" != "debug" ]]; then
     RELFLAG=release
-else
-    RELFLAG=debug
+    CARGO_PROFILE_FLAG=--release
 fi
 
 IS_SIMULATOR=0
@@ -56,6 +58,11 @@ if [ "${LLVM_TARGET_TRIPLE_SUFFIX-}" = "-simulator" ]; then
   IS_SIMULATOR=1
 fi
 
+SIM_ARM64_LIB=
+SIM_X86_64_LIB=
+DEVICE_ARM64_LIB=
+OUTPUT_LIB="$SRCROOT/lib${FFI_TARGET}.a"
+
 for arch in $ARCHS; do
   case "$arch" in
     x86_64)
@@ -66,20 +73,44 @@ for arch in $ARCHS; do
 
       # Intel iOS simulator
       export CFLAGS_x86_64_apple_ios="-target x86_64-apple-ios"
-      $CARGO rustc -p "${FFI_TARGET}" --lib --crate-type staticlib --$RELFLAG --target x86_64-apple-ios --features use-as-lib
+      $CARGO rustc -p "${FFI_TARGET}" --lib --crate-type staticlib ${CARGO_PROFILE_FLAG:+$CARGO_PROFILE_FLAG} --target x86_64-apple-ios --features use-as-lib
+      SIM_X86_64_LIB="$CARGO_TARGET_DIR/x86_64-apple-ios/${RELFLAG}/lib${FFI_TARGET}.a"
       ;;
 
     arm64)
       if [ $IS_SIMULATOR -eq 0 ]; then
         # Hardware iOS targets
-        $CARGO rustc -p "${FFI_TARGET}" --lib --crate-type staticlib --$RELFLAG --target aarch64-apple-ios --features use-as-lib
-        cp $SRC_ROOT/../../../target/aarch64-apple-ios/${RELFLAG}/lib${FFI_TARGET}.a $SRCROOT/lib${FFI_TARGET}.a
+        $CARGO rustc -p "${FFI_TARGET}" --lib --crate-type staticlib ${CARGO_PROFILE_FLAG:+$CARGO_PROFILE_FLAG} --target aarch64-apple-ios --features use-as-lib
+        DEVICE_ARM64_LIB="$CARGO_TARGET_DIR/aarch64-apple-ios/${RELFLAG}/lib${FFI_TARGET}.a"
       else
-        # M1 iOS simulator
-        $CARGO rustc -p "${FFI_TARGET}" --lib --crate-type staticlib --$RELFLAG --target aarch64-apple-ios-sim --features use-as-lib
-        cp $SRC_ROOT/../../../target/aarch64-apple-ios-sim/${RELFLAG}/lib${FFI_TARGET}.a $SRCROOT/lib${FFI_TARGET}.a
+        # Apple Silicon iOS simulator
+        $CARGO rustc -p "${FFI_TARGET}" --lib --crate-type staticlib ${CARGO_PROFILE_FLAG:+$CARGO_PROFILE_FLAG} --target aarch64-apple-ios-sim --features use-as-lib
+        SIM_ARM64_LIB="$CARGO_TARGET_DIR/aarch64-apple-ios-sim/${RELFLAG}/lib${FFI_TARGET}.a"
       fi
+      ;;
   esac
 done
 
-$CARGO run -p affine_mobile_native --features use-as-lib --bin uniffi-bindgen generate --library $SRCROOT/lib${FFI_TARGET}.a --language swift --out-dir $SRCROOT/../../ios/App/App/uniffi
+BINDGEN_LIB=
+if [ $IS_SIMULATOR -eq 0 ]; then
+  BINDGEN_LIB="$DEVICE_ARM64_LIB"
+elif [ -n "$SIM_ARM64_LIB" ]; then
+  BINDGEN_LIB="$SIM_ARM64_LIB"
+elif [ -n "$SIM_X86_64_LIB" ]; then
+  BINDGEN_LIB="$SIM_X86_64_LIB"
+else
+  echo "error: no simulator Rust library was produced" >&2
+  exit 1
+fi
+
+$CARGO run -p affine_mobile_native --features use-as-lib --bin uniffi-bindgen generate --library "$BINDGEN_LIB" --language swift --out-dir $SRCROOT/../../ios/App/App/uniffi
+
+if [ $IS_SIMULATOR -eq 0 ]; then
+  cp "$DEVICE_ARM64_LIB" "$OUTPUT_LIB"
+elif [ -n "$SIM_ARM64_LIB" ] && [ -n "$SIM_X86_64_LIB" ]; then
+  lipo -create "$SIM_ARM64_LIB" "$SIM_X86_64_LIB" -output "$OUTPUT_LIB"
+elif [ -n "$SIM_ARM64_LIB" ]; then
+  cp "$SIM_ARM64_LIB" "$OUTPUT_LIB"
+else
+  cp "$SIM_X86_64_LIB" "$OUTPUT_LIB"
+fi