Remove sidebar brand diamond; color homepage title with sidebar accent

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

manager/templates/base.html

@@ -277,7 +277,7 @@
     <div class="side-head">
       <button class="collapse-toggle" onclick="toggleCollapse()" title="Collapse sidebar" aria-label="Collapse sidebar"><i class="fa-solid fa-bars"></i></button>
       <a class="nav-brand" href="/">
-        <span class="brand-icon"><i class="fa-solid fa-diamond"></i></span><span class="brand-text">SimpleX Manager</span>
+        <span class="brand-text">SimpleX Manager</span>
       </a>
     </div>
     <nav class="side-nav">