feat(desktop): a simpler Keep This Mac Awake menu

The owner found the options confusing after the first test build. The
menu now reads Off / While Agents Work / Always, then on a MacBook
Only When Plugged In and With the Lid Closed…, then one status line.

- "Always While Codeman Is Open" is now "Always"; the status line says
  "Awake: Codeman is open".
- "Only on Power Adapter" is now "Only When Plugged In".
- "Remove the Lid Helper…" is gone: the lid item is the helper.
  Ticking it installs the helper behind the administrator prompt,
  unticking it removes it behind another. The setting changes only
  once the prompt's command ran, so a cancelled prompt leaves the item
  as it was.
- Shorter status lines ("Awake: agents working, lid closed too",
  "Paused: on battery", "Sleeps as usual: no agent working").

Config keys and values are unchanged, so a saved choice carries over.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/wiki/Installation.md

@@ -254,12 +254,12 @@ until you choose, and the menu only exists on such a Mac.
 
 **Codeman > Keep This Mac Awake** stops the Mac from going to sleep while your agents work
 on it (**While Agents Work**, plus 5 minutes after the last one stops), or for as long as
-the app is open (**Always While Codeman Is Open**). It is off until you choose, only acts
-for a Codeman running on this Mac, needs no password, and ends when the app quits. On a
-MacBook it pauses on battery unless you untick **Only on Power Adapter**, and **Also With
-the Lid Closed…** keeps a closed MacBook awake too: that one asks for your administrator
-password once to install a small helper, never acts on battery, and **Remove the Lid
-Helper…** takes it out again.
+the app is open (**Always**). It is off until you choose, only acts for a Codeman running
+on this Mac, needs no password, and ends when the app quits. On a MacBook it pauses on
+battery unless you untick **Only When Plugged In**, and **With the Lid Closed…** keeps a
+closed MacBook awake too: ticking it asks for your administrator password to install a
+small helper, unticking it asks again and removes the helper, and it never acts on
+battery.
 
 ### First launch