TODO

Fixes

Replace mb_strlen/mb_substr with strlen/substr in TfeController, SearchController, Parsedown — mbstring extension not available on production server
system.css: retheme to site light palette — remove all --sys-bg/border/text dark tokens from variables.css; replace with standard --bg-*, --border-*, --text-* tokens; remap --sys-syntax-* to light-appropriate colours; remove dark terminal aesthetic
SystemController: PHP-FPM status check — dynamically probe phpX.Y-fpm unit derived from running PHP version before static fallback list; add php8.4-fpm to cover current production PHP 8.4
Favicon: replace SVG placeholder with full PNG/ICO favicon set from public/assets/favicon/ in templates/head.php