feat(ui): add collapsible advanced settings and enlarge compose modal

Extract a shared forms collapsible for advanced SSH/build settings
across boarding, server creation, and application general. Support
larger modals with header actions, close the compose editor after
save via compose-save-finished, and cover the layout in tests.

app/Livewire/Project/Service/StackForm.php

@@ -140,6 +140,7 @@ class StackForm extends Component
     {
         $this->dockerComposeRaw = $raw;
         $this->submit(notify: true);
+        $this->dispatch('compose-save-finished');
     }
 
     public function instantSave()