Remove leftovers before a release

- gaze/tracker/lab/eyes_track.py: nothing used it
- Input Settings: the pointer role backend, whose page was removed
- ft-screens: no log line for every floating-window resize
- hands: ft-hands --help gives the palm-down default (1: off), the
  uninstall removes ft-handsctl's link, .frame-job is ignored
- Display Settings: "Save as profile…", not "Save current arrangement"
- two stale comments (ft-pointer's grabprobe, ft-gaze)

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

gaze/ft-gaze.cpp

@@ -1,5 +1,5 @@
 // ft-gaze: the headset's eye tracking as rays and Frametop screen pixels (OpenVR overlay
-// client, runs in the dev container). An experiment for gaze input; ft-gazeprobe reads it.
+// client, runs in the dev container). The gaze service (ft-gazed) and the gaze probe run it.
 //
 // Every eye tracker sample (90 Hz) becomes one JSON line on stdout with each gaze source
 // hit-tested against the Frametop screens: