Fix ActionView::MissingTemplate error on "Save and Add"

app/views/staff/time_slots/create.turbo_stream.haml

@@ -3,7 +3,7 @@
 
 %turbo-stream{action: 'datatable-add', target: 'organizer-time-slots'}
   %template
-    = render(time_slot_decorated)
+    = render(partial: 'staff/time_slots/time_slot', formats: [:html], object: time_slot_decorated)
 
 = turbo_stream.update 'flash' do
   = show_flash

app/views/staff/time_slots/update.turbo_stream.haml

@@ -2,7 +2,7 @@
 
 %turbo-stream{action: 'datatable-update', target: 'organizer-time-slots', 'row-id': @time_slot.id}
   %template
-    = render(time_slot_decorated)
+    = render(partial: 'staff/time_slots/time_slot', formats: [:html], object: time_slot_decorated)
 
 = turbo_stream.update 'flash' do
   = show_flash

spec/system/staff/time_slots_spec.rb

@@ -0,0 +1,25 @@
+require 'rails_helper'
+
+feature 'Staff Organizers can manage time slots', type: :system do
+  let(:event) { create(:event, start_date: Date.today, end_date: Date.today + 2.days) }
+  let!(:room) { create(:room, name: 'Main Hall', event: event) }
+  let!(:organizer_user) { create(:organizer, event: event) }
+
+  before { login_as(organizer_user) }
+
+  scenario 'creates a time slot via the "Save and Add" button', js: true do
+    visit event_staff_schedule_time_slots_path(event)
+
+    click_link 'Add Time Slot'
+
+    within('#time-slot-new-dialog') do
+      select '1', from: 'Day'
+      select 'Main Hall', from: 'Room'
+      click_button 'Save and Add'
+    end
+
+    expect(page).to have_content('Time slot added.')
+    expect(event.time_slots.count).to eq(1)
+    expect(page).to have_css('#organizer-time-slots tbody tr')
+  end
+end