Improve the ui/forms/text_field style

- 100% width by default
- Use tailwind/forms base styles

admin/app/components/solidus_admin/ui/forms/text_field/component.rb

@@ -63,7 +63,7 @@ def call
       disabled: @attributes[:disabled]
     )
 
-    tag.div(class: "mb-6") do
+    tag.div(class: "w-full mb-6") do
       label_tag + field_tag(guidance) + guidance_tag(guidance)
     end
   end
@@ -81,6 +81,7 @@ def field_tag(guidance)
 
   def field_classes(guidance)
     %w[
+      form-input
       block px-3 py-1.5 w-full
       text-black
       bg-white border border-gray-300 rounded-sm