refactor(swift-dash-core-sdk): suppress cargo build output on success

Only display cargo build logs when builds fail, showing clean checkmarks
for successful builds. This makes the build output more concise and easier
to read while still providing full diagnostics on failure.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: 2 people

swift-dash-core-sdk/build-ios.sh

@@ -20,20 +20,40 @@ rustup target add aarch64-apple-ios-sim
 rustup target add aarch64-apple-ios
 rustup target add x86_64-apple-ios
 
+# Function to run cargo build with output suppression
+run_cargo_build() {
+    local target=$1
+    local package=$2
+    local description=$3
+    
+    echo -e "${GREEN}Building $description...${NC}"
+    
+    # Capture output and error
+    local output
+    if output=$(cargo build --release --target "$target" -p "$package" 2>&1); then
+        echo -e "  ✓ $package"
+    else
+        echo -e "${RED}  ✗ $package failed!${NC}"
+        echo -e "${RED}Build output:${NC}"
+        echo "$output"
+        exit 1
+    fi
+}
+
 # Build for iOS Simulator (arm64)
 echo -e "${GREEN}Building for iOS Simulator (arm64)...${NC}"
-cargo build --release --target aarch64-apple-ios-sim -p dash-spv-ffi
-cargo build --release --target aarch64-apple-ios-sim -p key-wallet-ffi
+run_cargo_build "aarch64-apple-ios-sim" "dash-spv-ffi" "dash-spv-ffi for iOS Simulator (arm64)"
+run_cargo_build "aarch64-apple-ios-sim" "key-wallet-ffi" "key-wallet-ffi for iOS Simulator (arm64)"
 
 # Build for iOS Device (arm64)
 echo -e "${GREEN}Building for iOS Device (arm64)...${NC}"
-cargo build --release --target aarch64-apple-ios -p dash-spv-ffi
-cargo build --release --target aarch64-apple-ios -p key-wallet-ffi
+run_cargo_build "aarch64-apple-ios" "dash-spv-ffi" "dash-spv-ffi for iOS Device (arm64)"
+run_cargo_build "aarch64-apple-ios" "key-wallet-ffi" "key-wallet-ffi for iOS Device (arm64)"
 
 # Build for iOS Simulator (x86_64) - for Intel Macs
 echo -e "${GREEN}Building for iOS Simulator (x86_64)...${NC}"
-cargo build --release --target x86_64-apple-ios -p dash-spv-ffi
-cargo build --release --target x86_64-apple-ios -p key-wallet-ffi
+run_cargo_build "x86_64-apple-ios" "dash-spv-ffi" "dash-spv-ffi for iOS Simulator (x86_64)"
+run_cargo_build "x86_64-apple-ios" "key-wallet-ffi" "key-wallet-ffi for iOS Simulator (x86_64)"
 
 # Create universal binary for simulator
 echo -e "${GREEN}Creating universal binary for iOS Simulator...${NC}"