Improve iOS build directory documentation and clarity

- Add clarifying comment in ios/.gitignore for App/App/public directory
- Document that public directory contains Capacitor sync output from dist/
- Add comment in build-ios.sh clarifying build directory is temporary output
- Reinforces best practice of keeping platform files in ios/ folder

ios/.gitignore

@@ -1,6 +1,7 @@
 App/build
 App/Pods
 App/output
+# Capacitor sync output - contains web assets copied from dist/
 App/App/public
 DerivedData
 xcuserdata

scripts/build-ios.sh

@@ -174,7 +174,7 @@ check_ios_resources() {
 clean_ios_build() {
     log_info "Cleaning iOS build artifacts..."
     
-    # Clean Xcode build
+    # Clean Xcode build (temporary output directory)
     if [ -d "ios/App/build" ]; then
         rm -rf ios/App/build/
         log_debug "Cleaned ios/App/build/"