Release version 1.1.17 - Array duplicate prevention

Fixed persistent duplicate settings page by adding array-level duplicate
detection in addition to singleton pattern from v1.1.16.

Root Cause:
- WooCommerce calls woocommerce_get_settings_pages filter multiple times
- Even with singleton pattern, each filter call added settings instance to array
- Singleton prevented multiple class instances but not multiple array entries

Fixes:
- Settings page rendering twice despite singleton pattern in v1.1.16
- Filter adding same settings instance to array on repeated calls

Changes:
- Added duplicate detection loop in add_settings_page() before array append
- Uses strict comparison (===) to check if instance already in array
- Returns early if settings page already present, preventing duplicate

Technical Details:
- foreach loop iterates through existing $settings array
- Compares each element against cached self::$settings_instance
- Only appends to array if instance not found
- Complements singleton pattern with array-level protection
- Handles WooCommerce calling filter multiple times during page load

Updated Files:
- includes/class-wc-tpp-admin.php (added duplicate check in filter)
- wc-tier-and-package-prices.php (version 1.1.17)
- composer.json (version 1.1.17)
- CHANGELOG.md (v1.1.17 section)

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

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

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "magdev/wc-tier-package-prices",
     "description": "WooCommerce plugin for tier pricing and package prices with Twig templates",
-    "version": "1.1.16",
+    "version": "1.1.17",
     "type": "wordpress-plugin",
     "license": "GPL-2.0-or-later",
     "authors": [