feat(ui): create idiomatic UI matching previous katbin iteration

Signed-off-by: SphericalKat <amolele@gmail.com>

lib/ketbin_web/views/error_helpers.ex

@@ -11,7 +11,7 @@ defmodule KetbinWeb.ErrorHelpers do
   def error_tag(form, field) do
     Enum.map(Keyword.get_values(form.errors, field), fn error ->
       content_tag(:span, translate_error(error),
-        class: "invalid-feedback",
+        class: "absolute top-0 left-0 px-6 py-4",
         phx_feedback_for: input_name(form, field)
       )
     end)