Initial commit: EzTimer iOS app with widget extension

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

check_build.sh

@@ -0,0 +1,27 @@
+#!/bin/zsh
+set -o pipefail  # Fail if xcodebuild fails, even with xcbeautify
+
+# --- Configuration ---
+SCHEME="EzTimer"
+DEVICE_NAME="iPhone 17 Pro"
+BUILD_PATH="./build"
+
+echo "🔍 Checking compilation for $SCHEME..."
+
+# Build Only (No Install/Launch)
+# We use 'env -u' to hide Homebrew variables
+# We use '-derivedDataPath' to keep it isolated
+env -u CC -u CXX -u LIBCLANG_PATH xcodebuild \
+  -scheme "$SCHEME" \
+  -destination "platform=iOS Simulator,name=$DEVICE_NAME" \
+  -configuration Debug \
+  -derivedDataPath "$BUILD_PATH" \
+  build
+
+# Check exit code of the pipeline
+if [ $? -eq 0 ]; then
+    echo "✅ Build Succeeded. No errors found."
+else
+    echo "❌ Build Failed."
+    exit 1
+fi