Hide menu bar icons with a cover instead of moving them off screen

Sliding the icons off the screen meant bringing them all back just to
open one menu, which flickered. Draw a frosted window over the other
apps' icons instead: they keep their real positions, so tapping a tile
opens its menu in place with no reveal, and the cover leaves a gap so
the hamburger is never hidden.

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

README.md

@@ -23,30 +23,24 @@ permission (System Settings → Privacy & Security → Accessibility). The panel
 prompts for it; without it the Menu Bar section is empty and everything else
 still works.
 
-## Hiding menu bar items (best-effort)
+## Hiding menu bar items
 
-macOS has no public API to move another app's status item. The **Hide items from
-the menu bar** toggle uses the spacer technique: a zero-width status item is
-created at launch whose length is expanded to push the other icons off-screen so
-they only live in this panel. It is **on by default** (the choice is
-remembered), always undone on quit, and if the app dies macOS removes the spacer
-automatically.
+macOS has no public API to move another app's status item. Instead of moving
+them, the **Hide items from the menu bar** toggle (on by default, remembered)
+draws a frosted **cover** window over the other apps' icons. They keep their real
+positions, so tapping a tile in the panel opens that app's menu in the right
+place with **no flicker**, and the cover leaves a gap for the hamburger so it is
+never hidden.
 
-What it can and cannot hide:
+What it does and does not cover:
 
-- It hides **other third-party apps' icons** (cmux, Kapture, WireGuard, input
-  source, Now Playing, …) so only your apps' icons leave the bar.
-- It **keeps Wi-Fi, Spotlight, Clock, Battery and Control Center**. The spacer's
-  boundary is tuned (preferred position 250) to fall just left of Wi-Fi, so the
-  Apple items on the right stay visible. macOS reserves that far-right area: a
-  third-party item can never be placed to the right of it, so those icons cannot
-  be pushed away even in principle. (Bartender and Ice hit the same wall and
-  cover the area with their own overlay bar instead.)
-- Newly launched apps are placed to the left of the spacer, so they are hidden
-  automatically.
-- Advanced: set `defaults write dev.tzgyn.simpletopbar debug.spacerPos -float <n>`
-  to move the boundary (larger = keep more icons; > ~400 starts leaking app
-  icons back into the bar).
+- Covers **other third-party apps' icons** (cmux, Kapture, WireGuard, input
+  source, Now Playing, …).
+- Keeps **Wi-Fi, Spotlight, Clock, Battery and Control Center** visible — macOS
+  reserves that far-right area, so those icons stay put.
+- The cover matches the menu bar's frosted look only approximately; over an
+  unusual wallpaper the covered strip may be slightly visible.
+- Turning the toggle off removes the cover immediately; quitting does too.
 
 ## Install with Homebrew