Display the 'password incorrect' message in an ErrorBoxComponent

This matches the style of the ModelErrorComponent shown if the User
model itself has validation errors. I've added a specific flash key so
that this error box is not shown in the case where the `alert` key is
set for other reasons.

app/controllers/passwords_controller.rb

@@ -7,7 +7,8 @@ def update
     authorize @user
 
     if !@user.authenticate(params[:current_password])
-      redirect_to account_path, alert: 'The current password you entered is incorrect'
+      flash[:incorrect_password] = 'The current password you entered is incorrect'
+      redirect_to account_path
     elsif @user.update(user_params)
       redirect_to account_path, notice: 'Your password has been changed'
     else

app/views/users/show.html.erb

@@ -7,6 +7,9 @@
     </div>
     <div class="grow">
       <%= form_with(url: password_path, method: :patch, builder: TailwindFormBuilder) do |form| %>
+        <% if flash[:incorrect_password] %>
+          <%= render ErrorBoxComponent.new(title: 'Incorrect password').with_content(flash[:incorrect_password]) %>
+        <% end %>
         <%= render ModelErrorComponent.new(model: @user) %>
         <%= form.password_field :current_password, required: true, autofocus: true, autocomplete: "current-password", class: "w-full mb-3" %>
         <%= form.password_field :password, label: { text: "New password"}, required: true, autocomplete: "new-password", class: "w-full mb-3" %>

test/controllers/passwords_controller_test.rb

@@ -19,6 +19,6 @@ class PasswordsControllerTest < ActionDispatch::IntegrationTest
                     password_confirmation: 'Secret6*4*2*' }
 
     assert_redirected_to account_path
-    assert_equal 'The current password you entered is incorrect', flash[:alert]
+    assert_equal 'The current password you entered is incorrect', flash[:incorrect_password]
   end
 end