feat: add Codex configuration cleanup action

src/styles.css

@@ -4851,6 +4851,10 @@ input:focus-visible {
   width: 100%;
 }
 
+.agent-modification-buttons.codex {
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+}
+
 .agent-modification-buttons button {
   width: 100%;
   min-width: 0;
@@ -6192,6 +6196,10 @@ input:focus-visible {
 }
 
 @media (max-width: 620px) {
+  .agent-modification-buttons.codex {
+    grid-template-columns: 1fr;
+  }
+
   .config-side-stack {
     grid-template-columns: 1fr;
     grid-template-rows: repeat(2, 206px);