web: Enhance accordion header interactions for better UX (#12813)

web: Refine accordion headers for pressability.

- Allows user to click or tap anywhere on a accordion header to expand
  or collapse.
- Adds transition to collapse.

web/src/common/styles/authentik.css

@@ -125,6 +125,11 @@ html > form > input {
     margin-bottom: 6px;
 }
 
+.pf-m-pressable {
+    cursor: pointer;
+    user-select: none;
+}
+
 /* Flow-card adjustments for static pages */
 .pf-c-brand {
     padding-top: calc(

web/src/elements/forms/FormGroup.ts

@@ -3,6 +3,7 @@ import { AKElement } from "@goauthentik/elements/Base";
 import { msg } from "@lit/localize";
 import { CSSResult, TemplateResult, css, html } from "lit";
 import { customElement, property } from "lit/decorators.js";
+import { createRef, ref } from "lit/directives/ref.js";
 
 import PFButton from "@patternfly/patternfly/components/Button/button.css";
 import PFForm from "@patternfly/patternfly/components/Form/form.css";
@@ -14,13 +15,9 @@ import PFBase from "@patternfly/patternfly/patternfly-base.css";
  *
  * Mostly visual effects, with a single interaction for opening/closing the view.
  *
- */
+ * @todo Listen for custom events from its children about 'invalidation' events, and
-
-/**
- * TODO: Listen for custom events from its children about 'invalidation' events, and
  * trigger the `expanded` property as needed.
  */
-
 @customElement("ak-form-group")
 export class FormGroup extends AKElement {
     @property({ type: Boolean, reflect: true })
@@ -36,15 +33,68 @@ export class FormGroup extends AKElement {
             PFButton,
             PFFormControl,
             css`
+                /**
+                 * Workaround to trigger the hover effect on the button when the header is hovered.
+                 *
+                 * Alternatively, we group the expander button and header, but the grid would have to be
+                 * restructured to allow for this.
+                 */
+                .pf-c-form__field-group:has(.pf-c-form__field-group-header:hover) .pf-c-button {
+                    color: var(--pf-global--Color--100) !important;
+                }
+
+                /**
+                 * Transition ensuring a smooth animation when the body is expanded/collapsed.
+                 */
+                slot[name="body"] {
+                    transition-behavior: allow-discrete;
+                    transition-property: opacity, display, transform;
+                    transition-duration: var(--pf-global--TransitionDuration);
+                    transition-timing-function: var(--pf-global--TimingFunction);
+                    display: block;
+                    opacity: 1;
+                    transform: scaleY(1);
+                    transform-origin: top left;
+                    will-change: opacity, display, transform;
+                }
+
                 slot[name="body"][hidden] {
+                    opacity: 0 !important;
                     display: none !important;
+                    transform: scaleY(0) !important;
+                }
+
+                @media (prefers-reduced-motion) {
+                    slot[name="body"] {
+                        transition-duration: 0s;
+                    }
                 }
             `,
         ];
     }
 
+    formRef = createRef<HTMLFormElement>();
+
+    scrollAnimationFrame = -1;
+
+    scrollIntoView = (): void => {
+        this.formRef.value?.scrollIntoView({
+            behavior: "smooth",
+        });
+    };
+
+    toggleExpanded = (): void => {
+        cancelAnimationFrame(this.scrollAnimationFrame);
+
+        this.expanded = !this.expanded;
+
+        if (this.expanded) {
+            this.scrollAnimationFrame = requestAnimationFrame(this.scrollIntoView);
+        }
+    };
+
     render(): TemplateResult {
-        return html` <div class="pf-c-form">
+        return html`<div class="pf-c-form" ${ref(this.formRef)}>
             <div class="pf-c-form__field-group ${this.expanded ? "pf-m-expanded" : ""}">
                 <div class="pf-c-form__field-group-toggle">
                     <div class="pf-c-form__field-group-toggle-button">
@@ -53,9 +103,7 @@ export class FormGroup extends AKElement {
                             type="button"
                             aria-expanded="${this.expanded}"
                             aria-label=${this.ariaLabel}
-                            @click=${() => {
+                            @click=${this.toggleExpanded}
-                                this.expanded = !this.expanded;
-                            }}
                         >
                             <span class="pf-c-form__field-group-toggle-icon">
                                 <i class="fas fa-angle-right" aria-hidden="true"></i>
@@ -63,7 +111,12 @@ export class FormGroup extends AKElement {
                         </button>
                     </div>
                 </div>
-                <div class="pf-c-form__field-group-header">
+                <div
+                    class="pf-c-form__field-group-header pf-m-pressable"
+                    @click=${this.toggleExpanded}
+                    aria-expanded=${this.expanded}
+                    aria-role="button"
+                >
                     <div class="pf-c-form__field-group-header-main">
                         <div class="pf-c-form__field-group-header-title">
                             <div class="pf-c-form__field-group-header-title-text">