fix(hosting): fix Create Site button visibility

Button was invisible — likely due to bg-teal-600 not being in the
Tailwind CSS purge or $icon rendering issue. Switched to bg-purple-600
(known to work) and simplified button content.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/modules/hosting/templates/hosting/admin/site-new.html

@@ -97,9 +97,7 @@
             </a>
             <button type="button" @click="createSite()"
                     :disabled="!canCreate || creating"
-                    class="inline-flex items-center justify-center px-4 py-2 text-sm font-medium leading-5 text-white transition-colors duration-150 bg-teal-600 border border-transparent rounded-lg hover:bg-teal-700 focus:outline-none focus:shadow-outline-purple disabled:opacity-50 disabled:cursor-not-allowed">
+                    class="inline-flex items-center justify-center px-4 py-2 text-sm font-medium leading-5 text-white transition-colors duration-150 bg-purple-600 border border-transparent rounded-lg hover:bg-purple-700 focus:outline-none disabled:opacity-50 disabled:cursor-not-allowed">
-                <span x-show="!creating" x-html="$icon('plus', 'w-4 h-4 mr-2')"></span>
-                <span x-show="creating" x-html="$icon('spinner', 'w-4 h-4 mr-2')"></span>
                 <span x-text="creating ? 'Creating...' : 'Create Site'"></span>
             </button>
         </div>