create mango-session.target

user/mango-session.target

@@ -0,0 +1,30 @@
+# User target for GUI applets that must start only after mango has initialized
+# a real Wayland session and exported session environment variables to
+# systemd --user. We explicitly start this target from mango config once per
+# login, which avoids the default.target race where WAYLAND_DISPLAY is not yet
+# present in the user manager environment.
+#
+# Why this exists:
+# - default.target starts too early for Wayland-dependent desktop applets
+# - applets like waybar/swww/blueman then block in ExecStartPre and may timeout
+# - starting one dedicated target after environment import is deterministic
+#
+# What depends on this:
+# - waybar.service
+# - swww.service
+# - blueman-applet.service
+#
+# Start path:
+# - mango exec-once runs:
+#   systemctl --user import-environment ...
+#   dbus-update-activation-environment --systemd ...
+#   systemctl --user start mango-session.target
+#
+# Stop path:
+# - services are PartOf=mango-session.target, so stopping the target cleanly
+#   stops all attached applets.
+[Unit]
+Description=Mango Session Target
+Documentation=man:systemd.target(5)
+RefuseManualStop=no
+