Add ability to start lecture and redirect to recorded content.

app/views/attendance_tracker/index.html.erb

@@ -66,11 +66,14 @@
 
                       <td class="whitespace-nowrap px-3 py-4 text-sm text-gray-500">
                         <% if lecture.attendance.nil? %>
-                          <button type="button" class="rounded bg-indigo-600 px-2 py-1 font-semibold text-white shadow-sm hover:bg-indigo-500 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-indigo-600">
-                            Start
-                          </button>
+                          <%= button_to "Start",
+                                        lectures_start_path(id: lecture.id),
+                                        class: 'action-button'
+                          %>
                         <% else %>
-                          <%= link_to "Open recording", lecture.recording&.recording_url %>
+                          <% if lecture.recording %>
+                            <%= link_to "Open recording", lecture.recording&.recording_url %>
+                          <% end %>
                         <% end %>
                       </td>
                     <% end %>