Tray glyph: thinner strokes, outlined lock for legibility

1.8 -> 1.5 stroke weight and the lock body switches from solid fill to an
outline — the filled version read as a blob at menu-bar size.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

assets/tray/tray-glyph.svg

@@ -1,11 +1,12 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
   <!-- BunSCP tray glyph: black + alpha only (macOS template image).
        Same geometry as logo.svg, slightly bolder for menu-bar sizes. -->
-  <g fill="none" stroke="#000" stroke-width="1.8"
+  <g fill="none" stroke="#000" stroke-width="1.5"
      stroke-linecap="round" stroke-linejoin="round">
     <path d="M8.2 8.2 4.6 4.6m0 0v4.2m0-4.2h4.2"/>
     <path d="m15.8 15.8 3.6 3.6m0 0v-4.2m0 4.2h-4.2"/>
-    <path d="M13.3 11.2V9.9c0-1.95-2.6-1.95-2.6 0v1.3"/>
-    <rect x="9.4" y="11.2" width="5.2" height="4.6" rx="1.1" fill="#000" stroke="#000"/>
+    <!-- lock: outlined so the shackle + body silhouette stays readable small -->
+    <path d="M13.55 11V9.7c0-2.1-3.1-2.1-3.1 0V11"/>
+    <rect x="9.1" y="11" width="5.8" height="5" rx="1.2"/>
   </g>
 </svg>