Fix ASCII art alignment, readonly input opacity, api key visibility

Use white-space:pre-wrap on description view div so newlines and multiple
spaces are preserved natively — no <br> replacement, ASCII art aligns
correctly since body is already monospace (JetBrains Mono).

Override opacity:1 on readonly API key input so generated keys are fully
readable instead of being faded to 0.45 by base.css [readonly] rule.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

views/admin/ApiKeysView.php

@@ -44,7 +44,7 @@ include __DIR__ . '/../../views/layout_header.php';
     <div id="newKeyDisplay" class="lt-frame-inner lt-mt-sm is-hidden">
       <div class="lt-subsection-header lt-text-amber">&#x26A0; Copy this key now — you won't see it again!</div>
       <div class="lt-flex lt-flex-gap-sm lt-mt-sm">
-        <input type="text" id="newKeyValue" readonly class="lt-input" style="flex:1;font-family:monospace">
+        <input type="text" id="newKeyValue" readonly class="lt-input" style="flex:1;font-family:monospace;opacity:1;cursor:text">
         <button type="button" class="lt-btn lt-btn-sm" data-action="copy-api-key">COPY</button>
       </div>
     </div>