Logo única: guara.png e guara-s.png

A variante clara tinha artefatos; a arte escura recortada serve aos dois temas. Saem a troca de
variante por tema, os arquivos -light e a fonte clara; os arquivos escuros viram guara.png e
guara-s.png e o script, o app, o servidor do guara ui e o README usam só eles.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

apps/gui/ui/index.html

@@ -5,7 +5,7 @@
   <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
   <meta name="color-scheme" content="light dark">
   <title>Guará</title>
-  <link rel="icon" href="guara-dark-s.png" type="image/png">
+  <link rel="icon" href="guara-s.png" type="image/png">
   <link rel="stylesheet" href="app.css">
 </head>
 <body>
@@ -14,10 +14,10 @@
       <button class="icon-btn" id="menuBtn" aria-label="Abrir menu" aria-expanded="false">
         <svg viewBox="0 0 24 24" width="22" height="22"><path d="M4 7h16M4 12h16M4 17h16" stroke="currentColor" stroke-width="2" stroke-linecap="round" fill="none"/></svg>
       </button>
-      <img class="logo-img dark" src="guara-dark-s.png" width="24" height="24" alt=""><img class="logo-img light" src="guara-light-s.png" width="24" height="24" alt=""><strong>Guará</strong>
+      <img class="logo-img" src="guara-s.png" width="24" height="24" alt=""><strong>Guará</strong>
     </header>
     <aside class="sidebar" id="sidebar" aria-label="Dispositivos e sessões">
-      <div class="brand"><img class="logo-img dark" src="guara-dark-s.png" width="30" height="30" alt=""><img class="logo-img light" src="guara-light-s.png" width="30" height="30" alt=""><div><strong>Guará</strong><small>Recuperação de arquivos</small></div></div>
+      <div class="brand"><img class="logo-img" src="guara-s.png" width="30" height="30" alt=""><div><strong>Guará</strong><small>Recuperação de arquivos</small></div></div>
       <nav>
         <div class="side-title">Dispositivos <button class="icon-btn small" id="refreshBtn" title="Atualizar lista" aria-label="Atualizar lista"><svg viewBox="0 0 24 24" width="16" height="16"><path d="M20 12a8 8 0 1 1-2.5-5.8M20 4v5h-5" stroke="currentColor" stroke-width="2" fill="none" stroke-linecap="round" stroke-linejoin="round"/></svg></button></div>
         <ul id="deviceList" class="list"></ul>