cleanup and fix sonarqube findings

styles/configurable-reactions.css

@@ -167,11 +167,24 @@
 
 .configurable-reactions .cr-json-editor {
   flex: 1 1 auto;
+  display: flex;
+  flex-direction: column;
+  gap: 0.35rem;
   min-height: 0;
 }
 
+.configurable-reactions .cr-json-editor-heading,
+.configurable-reactions .cr-json-editor-heading label {
+  display: block;
+}
+
+.configurable-reactions .cr-json-editor-heading {
+  flex: 0 0 auto;
+}
+
 .configurable-reactions .cr-main textarea[name="reactionJson"] {
   width: 100%;
+  flex: 1 1 auto;
   height: 100%;
   min-height: 180px;
   font-family: var(--font-monospace, monospace);
@@ -239,7 +252,7 @@
   gap: 0.3rem;
   max-width: 100%;
   padding: 0.12rem 0.2rem 0.12rem 0.35rem;
-  border: 1px solid var(--color-border-light-secondary, #777);
+  border: none;
   border-radius: 999px;
   background: rgb(0 0 0 / 0.16);
   font-size: 70%;