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

biome.json

@@ -24,7 +24,13 @@
   "linter": {
     "enabled": true,
     "rules": {
-      "recommended": true
+      "recommended": true,
+      "style": {
+        "noDescendingSpecificity": "off"
+      },
+      "correctness": {
+        "noInnerDeclarations": "off"
+      }
     }
   },
   "formatter": {