design: username left in header, white elegant font

app/static/style.css

@@ -108,9 +108,11 @@ button {
 .header-left { display: flex; align-items: center; }
 .header-right { display: flex; align-items: center; gap: 0.75rem; }
 .header-username {
-  color: rgba(255,255,255,0.55);
-  font-size: 0.8rem;
-  letter-spacing: 0.03em;
+  color: #ffffff;
+  font-size: 1rem;
+  font-weight: 300;
+  letter-spacing: 0.08em;
+  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
 }
 .header-btn {
   display: inline-flex;

app/templates/dashboard.html

@@ -32,9 +32,10 @@
 </div>
 
   <header class="header">
-    <div class="header-left"></div>
-    <div class="header-right">
+    <div class="header-left">
       <span class="header-username">{{ user.username }}</span>
+    </div>
+    <div class="header-right">
       {% if user.is_admin %}
         <a href="/admin" class="header-btn">Администрирование</a>
       {% endif %}