feat(dashboard): add view course site actions and publish flow (#690)

Add View course site and Publish course options to org course context menus.
Replace the course header View as student button with View Course Site and
a companion overflow menu that includes View as student plus list actions.
Show a publish prompt modal for unpublished courses and support #publish
deep links in course settings.

apps/dashboard/src/lib/features/course/pages/settings.svelte

@@ -794,7 +794,7 @@
 
   <Field.Separator />
 
-  <Field.Set>
+  <Field.Set id="publish">
     <Field.Legend>{$t('course.navItem.settings.publish')}</Field.Legend>
     <Field.Description>{$t('course.navItem.settings.determines')}</Field.Description>
     <Field.Field orientation="horizontal">