Add tax_categories/edit component

The component renders the edit form inside a modal on top of the
tax categories list, inside a Turbo frame.

admin/app/components/solidus_admin/tax_categories/edit/component.html.erb

@@ -0,0 +1,28 @@
+<%= turbo_frame_tag :edit_tax_category_modal do %>
+  <%= render component("ui/modal").new(title: t(".title")) do |modal| %>
+    <%= form_for @tax_category, url: solidus_admin.tax_category_path(@tax_category), html: { id: form_id } do |f| %>
+      <div class="flex flex-col gap-6 pb-4">
+        <%= render component("ui/forms/field").text_field(f, :name) %>
+        <%= render component("ui/forms/field").text_field(f, :tax_code) %>
+        <%= render component("ui/forms/field").text_field(f, :description) %>
+        <label class="flex gap-2 items-center">
+          <%= render component("ui/forms/checkbox").new(
+              name: "#{f.object_name}[is_default]",
+              value: "1",
+              checked: f.object.is_default
+            ) %>
+            <span class="font-semibold text-xs ml-2"><%= Spree::TaxCategory.human_attribute_name :is_default %></span>
+          <%= render component("ui/toggletip").new(text: t(".hints.is_default")) %>
+        </label>
+      </div>
+      <% modal.with_actions do %>
+        <form method="dialog">
+          <%= render component("ui/button").new(scheme: :secondary, text: t('.cancel')) %>
+        </form>
+        <%= render component("ui/button").new(form: form_id, type: :submit, text: t('.submit')) %>
+      <% end %>
+    <% end %>
+  <% end %>
+<% end %>
+
+<%= render component("tax_categories/index").new(page: @page) %>

admin/app/components/solidus_admin/tax_categories/edit/component.rb

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+# frozen_string_literal: true
+
+class SolidusAdmin::TaxCategories::Edit::Component < SolidusAdmin::TaxCategories::Index::Component
+  def initialize(page:, tax_category:)
+    @page = page
+    @tax_category = tax_category
+  end
+
+  def form_id
+    dom_id(@tax_category, "#{stimulus_id}_edit_tax_category_form")
+  end
+end

admin/app/components/solidus_admin/tax_categories/edit/component.yml

@@ -0,0 +1,8 @@
+# Add your component translations here.
+# Use the translation in the example in your template with `t(".hello")`.
+en:
+  title: "Edit Tax Category"
+  cancel: "Cancel"
+  submit: "Update Tax Category"
+  hints:
+    is_default: "When checked, this tax category will be selected by default when creating new products or variants."