chore: bump version to 1.1.18 to test Xcode 26.0.1 release pipeline

Bumped version from 1.1.17 to 1.1.18 to test the newly updated release
pipeline with Xcode 26.0.1 and macOS 26 runners.

Changes:
- Version.xcconfig: 1.1.17 → 1.1.18
- Added CHANGELOG.md entry for v1.1.18 documenting Xcode upgrade

This will trigger the release pipeline automatically to verify:
- Xcode 26.0.1 builds successfully
- macOS 26 runners work correctly
- Fastlane 2.228.0 uploads to TestFlight properly

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

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

Author: graycreate

CHANGELOG.md

@@ -2,6 +2,11 @@
 
 All notable changes to V2er iOS app will be documented in this file.
 
+## v1.1.18 (Build XX)
+1. Improvement: Upgrade all CI/CD workflows to use Xcode 26.0.1 (latest version)
+2. Improvement: Use macOS 26 runners with Fastlane 2.228.0 for improved build performance
+3. Test: Verify release pipeline works correctly with new Xcode version
+
 ## v1.1.17 (Build XX)
 1. Fix: Restore stable release pipeline configuration from Oct 10
 2. Fix: Remove invalid Fastlane export_compliance parameters

V2er/Config/Version.xcconfig

@@ -6,7 +6,7 @@
 // VERSION_CODE: Build number (must always increase)
 
 // VERSION_NAME - This is what users see (e.g., 1.1.2)
-MARKETING_VERSION = 1.1.17
+MARKETING_VERSION = 1.1.18
 
 // VERSION_CODE - Internal build number (e.g., 29, 30, 31...)
 CURRENT_PROJECT_VERSION = 51