Replace random HSL gradients in homepage cards with header gradient

TODO.md

@@ -1,9 +1,4 @@
 # TODO
 
-## Fixes
-- [x] Typography: switch `--font-display` / title font from Combined to Ductus (`DuctusRegular.otf`)
-- [x] Replace `mb_strlen`/`mb_substr` with `strlen`/`substr` in TfeController, SearchController, Parsedown — mbstring extension not available on production server
-- [x] 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
-- [x] 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
-- [x] Favicon: replace SVG placeholder with full PNG/ICO favicon set from `public/assets/favicon/` in `templates/head.php`
-- [x] Rebrand: replace "PostErg" with "XAMXAM" in admin header link, default `<title>`, and OG site_name fallback
+- [x] Remove random HSL gradients from homepage cards and use header's background gradient
+- [ ] Review other gradient usages (check if any leftover random hue generation anywhere)