Keep overlay surfaces mapped so they open sharp (#13419)

The menu, emoji picker, clipboard, OSD, reminder flow and Wi-Fi QR code
mapped a fresh surface on every open. Qt drew its first frames before
Hyprland sent the surface's fractional scale: the pixel ratio stepped
2, 1, then 1.6, so on a 1.6 display each overlay showed blurry for
~350ms before going sharp.

A new OverlayWindow keeps the surface. Hidden, it parks as a 1x1,
input-less layer below windows, off the overlay layer so it never
blocks direct scanout. Showing only resizes and raises it, so the scale
is already settled. Content stays hidden until the surface has grown,
so no 1x1 frame is stretched across the screen, and the window follows
the focused monitor each time it is shown. The image picker's own
fullscreen parking moves onto it too.

Each parked overlay keeps a Qt window alive: at rest the shell holds
~40 MiB more RSS and ~20 MiB more GPU memory.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

test/acceptance.d/base-test.sh

@@ -81,8 +81,9 @@ layer_absent() {
   ! layer_present "$1"
 }
 
-# The image selector stays mapped between opens, parked on the bottom layer, so
-# it keeps its textures and fractional scale. Showing means on the overlay.
+# Overlays built on OverlayWindow (the menu, image selector, emoji picker,
+# clipboard and the like) stay mapped between opens, parked 1x1 on the bottom
+# layer, so they keep their fractional scale. Showing means on the overlay.
 layer_on_overlay() {
   hyprctl -j layers | jq -e --arg ns "$1" '[.[].levels["3"][]? | select(.namespace == $ns)] | length > 0'
 }

test/acceptance.d/menu-test.sh

@@ -63,7 +63,7 @@ source_file=$DEFAULTS_FILE
 original_position=$(jq -r '.bar.position // "top"' "$source_file")
 
 omarchy-shell shell summon omarchy.menu '{"menu":"root"}' >/dev/null
-wait_until "root menu opens" 15 layer_present "omarchy-menu"
+wait_until "root menu opens" 15 layer_on_overlay "omarchy-menu"
 wait_until "root menu content is visible" 15 screen_contains "Apps"
 screenshot "success-menu-01-root"
 
@@ -86,7 +86,7 @@ screenshot "success-menu-05-position-submenu"
 wtype -k Down -k Down -k Return
 wait_until "menu bar position changes to left" 20 bar_position_is "left"
 wait_until "menu bar becomes vertical" 20 bar_is_vertical
-wait_until "menu closes after selecting a position" 15 layer_absent "omarchy-menu"
+wait_until "menu closes after selecting a position" 15 layer_off_overlay "omarchy-menu"
 screenshot "success-menu-06-bar-left"
 
 if ((config_existed)); then

test/acceptance.d/shell-surfaces-test.sh

@@ -24,12 +24,12 @@ open_and_close() {
 # Search and select an emoji. The host harness separately proves the shortcut
 # with a QMP hardware key chord, while this test focuses on UI behavior.
 omarchy-shell shell summon omarchy.emojis >/dev/null
-wait_until "emoji picker opens" 15 layer_present "omarchy-emojis"
+wait_until "emoji picker opens" 15 layer_on_overlay "omarchy-emojis"
 wtype "rocket"
 sleep 1
 screenshot "success-emoji-picker-search"
 wtype -k Return
-wait_until "emoji picker selection closes" 15 layer_absent "omarchy-emojis"
+wait_until "emoji picker selection closes" 15 layer_off_overlay "omarchy-emojis"
 
 # Seed two clipboard entries, search for the older one, and copy it back out.
 clipboard_token="Omarchy acceptance clipboard $(date +%s)"
@@ -39,21 +39,21 @@ printf '%s' "clipboard decoy" | wl-copy
 sleep 1
 
 omarchy-shell shell summon omarchy.clipboard >/dev/null
-wait_until "clipboard opens" 15 layer_present "omarchy-clipboard"
+wait_until "clipboard opens" 15 layer_on_overlay "omarchy-clipboard"
 wtype "$clipboard_token"
 wait_until "clipboard search finds test text" 15 screen_contains "Omarchy acceptance clipboard"
 screenshot "success-clipboard-search"
 wtype -M shift -k Return -m shift
-wait_until "clipboard selection closes" 15 layer_absent "omarchy-clipboard"
+wait_until "clipboard selection closes" 15 layer_off_overlay "omarchy-clipboard"
 wait_until "clipboard selection restores test text" 15 bash -c '[[ $(wl-paste --no-newline) == "$1" ]]' _ "$clipboard_token"
 
 # Exercise the system branch without invoking any destructive action.
 omarchy-shell shell summon omarchy.menu '{"menu":"system"}' >/dev/null
-wait_until "system menu opens" 15 layer_present "omarchy-menu"
+wait_until "system menu opens" 15 layer_on_overlay "omarchy-menu"
 wait_until "system menu content is visible" 15 screen_contains "Shutdown"
 screenshot "success-system-menu"
 wtype -k Escape
-wait_until "system menu closes" 15 layer_absent "omarchy-menu"
+wait_until "system menu closes" 15 layer_off_overlay "omarchy-menu"
 
 # Preview both visual selectors and cancel without changing user state. These
 # cover thumbnail generation, the image-grid overlay, and current selection.
@@ -74,7 +74,7 @@ wait_until "theme selector closes" 15 layer_off_overlay "omarchy-image-selector"
 # Walk the reminder flow through each input screen, but dismiss before it
 # schedules a real timer in the test user's session.
 omarchy-shell shell summon omarchy.reminders >/dev/null
-wait_until "reminder flow opens" 15 layer_present "omarchy-reminders"
+wait_until "reminder flow opens" 15 layer_on_overlay "omarchy-reminders"
 screenshot "success-reminder-01-minutes-prompt"
 wtype "5"
 sleep 1
@@ -83,7 +83,7 @@ wtype -k Return
 wait_until "reminder message prompt opens" 15 screen_contains "Reminder message"
 screenshot "success-reminder-03-message-prompt"
 wtype -k Escape
-wait_until "reminder flow closes" 15 layer_absent "omarchy-reminders"
+wait_until "reminder flow closes" 15 layer_off_overlay "omarchy-reminders"
 
 # Render a real shell notification and clear it through the notification IPC.
 omarchy-shell notifications dismissAll >/dev/null
@@ -101,7 +101,7 @@ if window_present "(?i)omawrite" >/dev/null 2>&1; then
 fi
 
 omarchy-menu summon apps >/dev/null
-wait_until "apps menu opens" 15 layer_present "omarchy-menu"
+wait_until "apps menu opens" 15 layer_on_overlay "omarchy-menu"
 sleep 1
 screenshot "success-apps-menu-open"
 
@@ -111,7 +111,7 @@ screenshot "success-apps-menu-search"
 wtype -k Return
 
 wait_until "apps menu launches the top search hit" 60 window_present "(?i)omawrite"
-wait_until "apps menu closes after launching" 15 layer_absent "omarchy-menu"
+wait_until "apps menu closes after launching" 15 layer_off_overlay "omarchy-menu"
 
 close_windows "(?i)omawrite"
 wait_until "Omawrite window closes" 30 window_absent "(?i)omawrite"