Rename command controller => terminal controller and name the error class after terminal

app/javascript/controllers/terminal_controller.js

@@ -0,0 +1,26 @@
+import { Controller } from "@hotwired/stimulus"
+
+export default class extends Controller {
+  static targets = [ "input" ]
+  static classes = [ "error" ]
+
+  // Actions
+
+  focus() {
+    this.inputTarget.focus()
+  }
+
+  handleSubmit(event) {
+    if (event.detail.success) {
+      event.target.reset()
+    } else {
+      this.#handleErrorResponse(event.detail.fetchResponse.response.status)
+    }
+  }
+
+  #handleErrorResponse(code) {
+    if (code == 422) {
+      this.element.classList.add(this.errorClass)
+    }
+  }
+}