Fix PHP 8.4 compatibility issues - Resolves fatal error and warnings

[nukeador]

Summary

This PR resolves critical PHP 8.4 compatibility issues that were preventing the ISOC WordPress theme from functioning properly on modern PHP versions.

Issues Fixed

• 🔴 Fatal Error: Undefined constant OD_ENV in footer.php:11 (Fixes Use of undefined constant OD_ENV  #19, Undefined Constant #18)
• ⚠️ Warning: Undefined array key "Not found" in od/includes/hooks-setup.php:117

Root Causes

1. Undefined Constant: The OD_ENV constant was referenced but never defined, causing fatal errors that prevented front-end loading
2. Missing Array Key: The theme creates a "Not found" page but the color array didn't include this key, generating PHP 8+ warnings

Changes Made

1. Fixed Undefined Constant (footer.php)

// Before
<?php if(OD_ENV == 'local') : ?>

// After  
<?php if(defined('OD_ENV') && OD_ENV == 'local') : ?>

2. Fixed Array Key Issue (od/includes/hooks-setup.php)

// Added missing color entry
$aBaseColors = array(
    'News'          => 'beige',
    'Events'        => 'blue',
    'European news' => 'turquoise',
    'About'         => 'purple',
    'Contact'       => 'yellow',
    'Not found'     => 'beige'  // ← Added this line
);

// Added safety fallback
$color = isset($aBaseColors[$oPage->post_title]) ? $aBaseColors[$oPage->post_title] : 'beige';

Testing Environment

• WordPress: 6.8.2
• PHP: 8.4.13
• Database: MySQL 8.0
• Environment: Docker containerized testing

Test Results

Before Fixes ❌

• Fatal error on front-end preventing page load
• PHP warnings in admin area
• Theme partially functional

After Fixes ✅

• Front-end loads completely without errors
• Admin area works without warnings
• All theme functionality preserved
• Plugin dependency notices work correctly

Plugin Dependencies

Theme continues to properly handle required/recommended plugins:

• Required: Advanced Custom Fields, Events Manager
• Recommended: Regenerate Thumbnails, Wordfence Security

Backwards Compatibility

✅ These fixes are fully backwards compatible with older PHP versions (7.4+) and maintain all existing functionality.

Related Issues

• Closes Use of undefined constant OD_ENV  #19 - "Use of undefined constant OD_ENV"
• Closes Undefined Constant #18 - "Undefined Constant"
• Related to Unnecessary inclusion of browsersync script, for developer only #20 - "Unnecessary inclusion of browsersync script" (OD_ENV usage)

---

Tested and verified working on PHP 8.4.13 with full WordPress functionality intact.