justfile: standardise test recipes to lint-php/lint-css/lint-js/test + add fix recipe

- Removed ambiguous aliases: phpstan, cs-check, syntax
- Split lint-biome into lint-css and lint-js with correct paths
- Added lint meta-recipe and fix recipe (biome --unsafe + php-cs-fixer)
- Fixed FormBootstrap dead null check, CSS shorthand override bug
- Updated phpstan baseline, suppressed noDescendingSpecificity/noInnerDeclarations
- Applied ~74 biome auto-fixes across CSS/JS

TODO.md

@@ -18,4 +18,4 @@
 - [x] Add bulk select/delete to tmp cleanup dialog (like admin/index.php pattern)
 - [x] Move cleanup UI from modal to dedicated page (like add.php/edit.php)
 - [x] Replace <details> with <fieldset>/<legend> in cleanup fragments (like contenus.php)
-- [x] Standardise test group recipes: lint-php, lint-css, lint-js, test + add fix recipe
+- [x] Standardise test group recipes: lint-php, lint-css, lint-js, test + add fix recipe + make lint pass clean