fix(ui): hide token modal backdrop when dismissed

The "copy your new token" modal applied x-show only to the inner
card, so the dark backdrop and click-blocking overlay stayed in the
DOM after the user clicked "I have stored it safely", leaving the
page unusable until reload. Move x-show onto the backdrop wrapper so
the whole modal hides together.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

ui/resources/views/pages/tokens/index.twig

@@ -112,9 +112,9 @@
 </div>
 
 {% if just_created %}
-<div x-data="{ open: true }" x-init="$nextTick(() => open = true)"
+<div x-data="{ open: true }" x-show="open"
      class="fixed inset-0 z-50 flex items-center justify-center bg-slate-900/70 px-4">
-    <div x-show="open" class="w-full max-w-lg rounded-2xl border border-amber-300 bg-white p-6 shadow-2xl dark:border-amber-700 dark:bg-slate-900">
+    <div class="w-full max-w-lg rounded-2xl border border-amber-300 bg-white p-6 shadow-2xl dark:border-amber-700 dark:bg-slate-900">
         <h2 class="text-lg font-semibold text-amber-700 dark:text-amber-300">Copy this token now</h2>
         <p class="mt-2 text-sm text-slate-600 dark:text-slate-400">
             This is the only time you'll see the raw token. Refreshing this page or closing the dialog discards it permanently.