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.

resources/views/components/modal-input.blade.php

@@ -12,6 +12,7 @@
     // Optional Livewire bool property to entangle open state (survives Livewire re-renders).
     'wireOpen' => null,
     'contentClicks' => true,
+    'isLarge' => false,
 ])
 
 @php
@@ -54,10 +55,19 @@
                     x-transition:leave="ease-in duration-100"
                     x-transition:leave-start="opacity-100 translate-y-0 sm:scale-100"
                     x-transition:leave-end="opacity-0 -translate-y-2 sm:scale-95"
-                    class="application-settings-form application-settings-section relative max-h-[calc(100dvh-2rem)] w-full lg:w-auto lg:min-w-2xl lg:max-w-4xl"
+                    @class([
+                        'application-settings-form application-settings-section relative flex max-h-[calc(100dvh-2rem)] w-full flex-col overflow-hidden',
+                        'lg:w-[95vw]! lg:max-w-7xl!' => $isLarge,
+                        'lg:w-auto lg:min-w-2xl lg:max-w-4xl' => ! $isLarge,
+                    ])
                     style="box-shadow: 0 0 0 1px var(--coollabs-hairline), var(--shadow-modal)">
                     <header class="flex-nowrap!">
                         <h3 class="min-w-0 flex-1 truncate">{{ $title }}</h3>
+                        @isset($headerActions)
+                            <div class="flex shrink-0 items-center gap-2">
+                                {{ $headerActions }}
+                            </div>
+                        @endisset
                         <button type="button" @click="modalOpen=false"
                             class="flex size-7 shrink-0 cursor-pointer items-center justify-center rounded-md text-neutral-500 outline-0 transition-colors hover:bg-neutral-100 hover:text-black focus-visible:outline-none focus-visible:ring-1 focus-visible:ring-accent dark:text-fg-faint dark:hover:bg-white/[0.06] dark:hover:text-fg">
                             <x-reicon name="x" class="size-4" />