Undocumented apps: per-device filter and wider device column; presence for Skip USMT

- Source Devices in the undocumented-apps list filters by device name, like
  the software columns; Devices and the action column take less room.
- Drop the one-click documented pick (Documented + Only ticked does it).
- Stage legend underline spans label and number.
- Device details title stays on one line; the name truncates instead.
- Presence sweep also pings devices under Skip USMT tags.

Config/usmt-dash.psd1

@@ -52,8 +52,9 @@
         # A task-sequence log modified within this window counts as "active"
         ActiveLogHours     = 24
 
-        # Completed pairs skip network checks in the sweep, so they're pinged this often to keep
-        # "last online" / "days offline" current (every other device is pinged every cycle).
+        # Completed pairs and Skip USMT devices skip network checks in the sweep, so they're
+        # pinged this often to keep "last online" / "days offline" current (every other device
+        # is pinged every cycle).
         # Cycles only run in business hours plus the midnight pitstop: 60 = hourly, plus midnight.
         PresenceSweepMinutes = 60
     }