fix: add Fastlane UI import to changelog_helper

Fixes NameError: uninitialized constant ChangelogHelper::UI
by importing FastlaneCore::UI module.

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

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

Author: graycreate

fastlane/changelog_helper.rb

@@ -1,7 +1,11 @@
 # changelog_helper.rb
 # Helper module to extract changelog entries from CHANGELOG.md
 
+require 'fastlane_core/ui/ui'
+
 module ChangelogHelper
+  # Import Fastlane's UI for logging
+  UI = FastlaneCore::UI unless Fastlane.const_defined?(:UI)
   # Extract changelog for a specific version from CHANGELOG.md
   # @param version [String] The version to extract (e.g., "1.1.1")
   # @return [String] The changelog content for the specified version