Hide other menu bar icons by default

The point of the app is a single hamburger that replaces the tray, so
hiding the other icons should be the out-of-the-box state. Remember the
user's choice, and create the hamburger before the hider so it is not
itself pushed off-screen.

💘 Generated with Crush

Assisted-by: Crush:deepseek-v4.1-flash

AGENTS.md

@@ -119,7 +119,8 @@ no control over this, so the app creates its own `NSStatusItem` and:
 ## Hiding other menu bar items
 
 `MenuBarHider` creates a zero-width spacer `NSStatusItem` at launch and grows its
-length to `hiddenLength` (10_000) to push the icons on its left off-screen. Its
+length to `hiddenLength` (10_000) to push the icons on its left off-screen. It is
+**on by default** (`hideMenuBarItems` defaults to true, then persisted). Its
 preferred position controls where the hidden/kept boundary lands:
 
 - Seed **250** (default) puts the boundary just left of Wi-Fi, so every
@@ -129,6 +130,9 @@ preferred position controls where the hidden/kept boundary lands:
 - Verified with `--diag-hide` across positions 100–400. Below ~200 Wi-Fi gets
   hidden too; above ~300 app icons (Now Playing, TextInput) leak back.
 - `debug.spacerPos` (Double) overrides the seed for tuning without rebuilding.
+- **Order matters**: `AppDelegate` must call `setupStatusItem()` *before*
+  `MenuBarHider.shared.prepare()`. If the hider contracts the bar first, the
+  hamburger is created into the collapsed space and lands off-screen.
 - **Wi-Fi/Spotlight/Clock/Battery/Control Center cannot be hidden**: macOS pins
   them to the far right and a third-party item can never be inserted to their
   right, so the spacer has nothing to push them with. This is a macOS