Fix species face picker going inert again after Turbo frame load

Here, I remember the trick I learned when building the outfit viewer:
web components are great for making sure stuff stays initialized well
in a Turbo environment!

The problem was, after submitting the form and getting a new preview
loaded via Turbo, the part where we remove `inert` would get undone.
Additionally, this script only loads *once* per session, so if you
Turbo-nav to a different item then that part of the page never ran.

Instead, we use web components to remove the attributes on mount, then
again if they're ever reapplied by Idiomorph.

app/assets/javascripts/items/show.js

@@ -1,6 +1,6 @@
-// When the species *face* picker changes, update and submit the main picker form.
-document.addEventListener("click", (e) => {
-    if (!e.target.matches(".species-face-picker input[type=radio]")) return;
+// When the species face picker changes, update and submit the main picker form.
+document.addEventListener("change", (e) => {
+    if (!e.target.matches("species-face-picker")) return;
 
     try {
         const mainPicker = document.querySelector("#item-preview .species-color-picker");
@@ -14,8 +14,43 @@ document.addEventListener("click", (e) => {
     }
 });
 
-// Now that the face picker is ready to go, mark it as usable.
-for (const options of document.querySelectorAll(".species-face-picker-options")) {
-    options.removeAttribute("inert");
-    options.removeAttribute("aria-hidden");
+class SpeciesFacePicker extends HTMLElement {
+    connectedCallback() {
+        this.addEventListener("click", this.#handleClick);
+    }
+
+    get value() {
+        return this.querySelector("input[type=radio]:checked")?.value;
+    }
+
+    #handleClick(e) {
+        if (e.target.matches("input[type=radio]")) {
+            this.dispatchEvent(new Event("change", {bubbles: true}));
+        }
+    }
 }
+
+class SpeciesFacePickerOptions extends HTMLElement {
+    static observedAttributes = ["inert", "aria-hidden"];
+
+    connectedCallback() {
+        // Once this component is loaded, we stop being inert and aria-hidden. We're ready!
+        this.#activate();
+    }
+
+    attributeChangedCallback() {
+        // If a Turbo Frame tries to morph us into being inert again, activate again!
+        // (It's important that the server's HTML always return `inert`, for progressive
+        // enhancement; and it's important to morph this element, so radio focus state
+        // is preserved. To thread that needle, we have to monitor and remove!)
+        this.#activate();
+    }
+
+    #activate() {
+        this.removeAttribute("inert");
+        this.removeAttribute("aria-hidden");
+    }
+}
+
+customElements.define("species-face-picker", SpeciesFacePicker);
+customElements.define("species-face-picker-options", SpeciesFacePickerOptions);

app/assets/stylesheets/items/_show.sass

@@ -161,7 +161,8 @@ body.items-show
         border-color: $error-border-color
         color: $error-color
 
-  .species-face-picker
+  species-face-picker
+    display: block
     position: relative
 
     input[type=radio]
@@ -186,13 +187,14 @@ body.items-show
       inset: 0
       background: rgba(white, .75)
       z-index: 1
+      cursor: auto
 
       display: flex
       align-items: center
       justify-content: center
       text-align: center
 
-    &:has(.species-face-picker-options[inert])
+    &:has(species-face-picker-options[inert])
       cursor: wait
 
   .item-zones-info

app/views/items/show.html.haml

@@ -33,12 +33,12 @@
         "id", "human_name", @selected_preview_pet_type.species_id)
     = submit_tag "Go", name: nil
 
-  %form.species-face-picker
+  %species-face-picker
     %noscript
       This fancy species picker requires Javascript, but you can still use the
       dropdowns instead!
-    .species-face-picker-options{
-      "inert": true, # waits for JS to remove
+    %species-face-picker-options{
+      inert: true, # waits for JS to remove
       "aria-hidden": true, # waits for JS to remove
     }
       - @preview_pet_type_options.each do |pet_type|