Add fieldset group form

Author: bsatarnejad

app/lib/primer/forms/fieldset_group.html.erb

@@ -0,0 +1,10 @@
+<%= render(Primer::BaseComponent.new(**@system_arguments)) do %>
+  <%= render(Primer::OpenProject::Fieldset.new(**@fieldset_arguments)) do %>
+    <%=
+      render(Primer::Beta::Subhead.new) do |component|
+        component.with_heading(**@heading_arguments).with_content(@title)
+      end
+    %>
+    <%= render(Primer::Forms::Group.new(**@group_arguments)) %>
+  <% end %>
+<% end %>

app/lib/primer/forms/fieldset_group.rb

@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+module Primer
+  module Forms
+    # :nodoc:
+    class FieldsetGroup < BaseComponent
+      ##
+      # @param title [String] The title displayed as the heading for the fieldset
+      # @param inputs [Array<Primer::Forms::Dsl::Input>] Array of form inputs to be grouped
+      # @param builder [ActionView::Helpers::FormBuilder] The form builder instance
+      # @param form [Primer::Forms::BaseForm] The form object
+      # @param layout [Symbol] Layout style for the input group (default: :default_layout)
+      # @param heading_arguments [Hash] Arguments passed to the heading component
+      # @option heading_arguments [String] :id The ID for the heading element
+      # @option heading_arguments [Symbol] :tag The HTML tag for the heading (default: :h3)
+      # @option heading_arguments [Symbol] :size The size of the heading (default: :medium)
+      # @param group_arguments [Hash] Arguments passed to the input group component
+      # @param system_arguments [Hash] Additional system arguments passed to the section wrapper
+      def initialize( # rubocop:disable Metrics/AbcSize
+        title:,
+        inputs:,
+        builder:,
+        form:,
+        layout: Primer::Forms::Group::DEFAULT_LAYOUT,
+        heading_arguments: {},
+        group_arguments: {},
+        **system_arguments
+      )
+        super()
+
+        @title = title
+
+        @heading_arguments = heading_arguments
+        @heading_arguments[:id] ||= "subhead-#{SecureRandom.uuid}"
+        @heading_arguments[:tag] ||= :h3
+        @heading_arguments[:size] ||= :medium
+
+        @fieldset_arguments = {
+          legend_text: @title,
+          visually_hide_legend: true,
+          aria: { labelledby: @heading_arguments[:id] }
+        }
+        @group_arguments = group_arguments.merge(inputs:, builder:, form:, layout:)
+
+        @system_arguments = system_arguments
+        @system_arguments[:tag] = :section
+        @system_arguments[:mb] ||= 4
+        @system_arguments[:aria] ||= {}
+        @system_arguments[:aria][:labelledby] = @heading_arguments[:id]
+        @system_arguments[:hidden] = :none if inputs.all?(&:hidden?)
+      end
+    end
+  end
+end