Fix NODE_BINARY for Xcode build phases in CI

Write .xcode.env.local with explicit node path so the "Bundle React
Native code and images" build phase can find node. Xcode build phases
don't inherit the GitHub Actions PATH. Also disable xcbeautify for
this run to see raw xcodebuild output for debugging.

mobile/fastlane/Fastfile

@@ -116,14 +116,10 @@ platform :ios do
     match(
       type: "appstore",
       readonly: true,
-      verbose: true,
       keychain_name: "fastlane_tmp_keychain",
       keychain_password: ""
     )
 
-    sh("security find-identity -v -p codesigning || true")
-    sh("security find-identity -v -p codesigning #{File.expand_path("~/Library/Keychains/fastlane_tmp_keychain-db")} || true")
-
     update_code_signing_settings(
       use_automatic_signing: false,
       team_id: "9KAQYC653W",
@@ -132,6 +128,10 @@ platform :ios do
       path: "ios/ProposalSystem.xcodeproj"
     )
 
+    node_path = sh("which node").strip
+    File.write("ios/.xcode.env.local", "export NODE_BINARY=#{node_path}\n")
+    UI.message("NODE_BINARY set to #{node_path}")
+
     increment_build_number(
       build_number: ENV["GITHUB_RUN_NUMBER"],
       xcodeproj: "ios/ProposalSystem.xcodeproj"
@@ -144,7 +144,8 @@ platform :ios do
       export_method: "app-store",
       export_team_id: "9KAQYC653W",
       output_directory: "build",
-      output_name: "ProposalSystem.ipa"
+      output_name: "ProposalSystem.ipa",
+      xcodebuild_formatter: ""
     )
 
     upload_to_testflight(skip_waiting_for_build_processing: true)