Unify primary buttons with gradient pill design across the app.

Add shared btn-primary components and plus icons on create/new actions for a consistent Ladill UI.

Co-authored-by: Cursor <cursoragent@cursor.com>

resources/views/email/mailboxes/show.blade.php

@@ -20,7 +20,7 @@
             <div class="flex justify-between"><dt class="text-slate-500">IMAP</dt><dd class="font-mono text-slate-800">{{ $host }}:993 (SSL)</dd></div>
             <div class="flex justify-between"><dt class="text-slate-500">SMTP</dt><dd class="font-mono text-slate-800">{{ $host }}:587 (STARTTLS)</dd></div>
         </dl>
-        <a href="https://{{ $host }}" class="mt-4 inline-block rounded-lg bg-indigo-600 px-4 py-2 text-sm font-semibold text-white hover:bg-indigo-700">Open Webmail ↗</a>
+        <a href="https://{{ $host }}" class="mt-4 inline-block btn-primary">Open Webmail ↗</a>
     </div>
 
     @php
@@ -46,7 +46,7 @@
                 </p>
             </div>
             @if($quotaMb < $maxMb)
-                <a href="{{ route('email.mailboxes.upgrade', $mailbox['id']) }}" class="rounded-lg bg-indigo-600 px-4 py-2 text-sm font-semibold text-white hover:bg-indigo-700">Upgrade</a>
+                <a href="{{ route('email.mailboxes.upgrade', $mailbox['id']) }}" class="btn-primary">Upgrade</a>
             @else
                 <span class="rounded-lg bg-slate-100 px-3 py-2 text-xs font-medium text-slate-500">Top plan</span>
             @endif