Split the tray into Apps and System sections

Control Center items sat in the same grid as third-party app icons, which
was hard to scan. Group them so Apple's Wi-Fi, Battery, Clock and friends
are listed separately from your apps' icons.

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README.md

@@ -5,9 +5,9 @@ collects every other app's menu bar (tray) icons, plus every app running on your
 Mac, into three sections:
 
 - **Menu Bar** — a tray of all other apps' menu bar items, discovered through
-  the Accessibility API. Click one to open its real menu. Optionally **hide the
-  items from the menu bar** so they only live inside this panel (best-effort;
-  see below).
+  the Accessibility API. It is split into **Apps** and **System** sections.
+  Click one to open its real menu. Optionally **hide the items from the menu
+  bar** so they only live inside this panel (best-effort; see below).
 - **Apps** — regular apps that live in the Dock.
 - **Background Apps** — accessory/agent apps without a Dock icon. This section
   is a **dropdown**: it stays collapsed to a single header, and when you expand