Remember power profile choices per power source across reboots

Explicit profile selections from the power panel or menu are now saved
under an ac/battery key in ~/.local/state/omarchy/powerprofiles and
reapplied on boot and on plug/unplug. Only successful, user-made
selections are persisted, so the performance/balanced defaults still
apply when nothing has been chosen.

All entry points key off the same power signal, UPower's OnBattery:
the shell reads it natively and omarchy-powerprofiles-set autodetect
queries it via busctl. This replaces the sysfs online checks, which
disagreed with the shell on desktops without power_supply entries and
lagged behind plug events on some USB-C laptops.

Plug/unplug switching moves from the udev rule into the shell's battery
service, which already receives UPower's debounced state changes, so
the udev rule and its settle-sleep workaround are gone.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

shell/plugins/menu/Menu.qml

@@ -228,7 +228,7 @@ Item {
     "power-profiles": {
       script: "current=$(powerprofilesctl get 2>/dev/null); omarchy-powerprofiles-list 2>/dev/null | while read -r p; do [[ -z $p ]] && continue; printf '%s\\t%s\\t%s\\n' \"$p\" \"$p\" \"$current\"; done",
       icon: "\udb81\udc0b",
-      actionFor: function(value) { return "powerprofilesctl set '" + value.replace(/'/g, "'\\''") + "'" },
+      actionFor: function(value) { return "omarchy-powerprofiles-set autodetect '" + value.replace(/'/g, "'\\''") + "'" },
       keywordsFor: function(value) { return value + " power profile" }
     }
   })