Brand: match bincio_activity logo style (bold, tight tracking, accent on product name)

src/Planner.svelte

@@ -183,7 +183,7 @@ ${trkpts}
   <!-- Sidebar -->
   <aside class="sidebar">
     <header class="brand">
-      <span class="logo"><b>Bincio</b><span class="accent">Planner</span></span>
+      <span class="logo">Bincio<span class="accent">Planner</span></span>
       <a href={activityUrl} class="back-link">← Activity</a>
     </header>
 
@@ -277,7 +277,7 @@ ${trkpts}
     justify-content: space-between;
     flex-shrink: 0;
   }
-  .logo { font-size: 1rem; }
+  .logo { font-size: 1rem; font-weight: 700; letter-spacing: -0.02em; color: #fff; }
   .accent { color: var(--accent); }
   .back-link { font-size: 0.75rem; color: var(--text-5); text-decoration: none; }
   .back-link:hover { color: var(--text-4); }