JS-1203 Add Tailwind CSS v4 at-rules to S4662 ignore list (#6308)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: zglicz

sonar-plugin/css/src/main/java/org/sonar/css/rules/AtRuleNoUnknown.java

@@ -27,7 +27,7 @@
 public class AtRuleNoUnknown implements CssRule {
 
   private static final String DEFAULT_IGNORED_AT_RULES =
-    "value,at-root,content,debug,each,else,error,for,function,if,include,mixin,return,warn,while,extend,use,forward,tailwind,apply,layer,container,theme,/^@.*/";
+    "value,at-root,content,debug,each,else,error,for,function,if,include,mixin,return,warn,while,extend,use,forward,tailwind,apply,layer,container,theme,utility,custom-variant,source,plugin,config,reference,variant";
 
   @RuleProperty(
     key = "ignoreAtRules",

sonar-plugin/css/src/test/java/org/sonar/css/rules/CssRuleTest.java

@@ -149,7 +149,7 @@ void selector_pseudo_element_no_unknown_custom() {
   void at_rule_unknown_default() {
     String optionsAsJson = GSON.toJson(new AtRuleNoUnknown().stylelintOptions());
     assertThat(optionsAsJson).isEqualTo(
-      "[true,{\"ignoreAtRules\":[\"value\",\"at-root\",\"content\",\"debug\",\"each\",\"else\",\"error\",\"for\",\"function\",\"if\",\"include\",\"mixin\",\"return\",\"warn\",\"while\",\"extend\",\"use\",\"forward\",\"tailwind\",\"apply\",\"layer\",\"container\",\"theme\",\"/^@.*/\"]}]"
+      "[true,{\"ignoreAtRules\":[\"value\",\"at-root\",\"content\",\"debug\",\"each\",\"else\",\"error\",\"for\",\"function\",\"if\",\"include\",\"mixin\",\"return\",\"warn\",\"while\",\"extend\",\"use\",\"forward\",\"tailwind\",\"apply\",\"layer\",\"container\",\"theme\",\"utility\",\"custom-variant\",\"source\",\"plugin\",\"config\",\"reference\",\"variant\"]}]"
     );
   }