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>

hands/track/main.cpp

@@ -221,7 +221,7 @@ int main(int argc, char **argv) {
                         "          [--keep-presence P] (0.5) [--ring PATH] (ft-camd's, or ft-ringplay's)\n"
                         "          [--cams auto|mono|color|all] (auto) [--bright all|color] (all) [--bright-on L] (40) [--bright-off L] (25)\n"
                         "          [--color-left color_video0|color_video3] [--color-crop subtract|none]\n"
-                        "          [--pinch-begin M] (0.020) [--pinch-end M] (0.035) [--pinch-triangulated] [--pinch-palm-down MAX] (0.6)\n"
+                        "          [--pinch-begin M] (0.020) [--pinch-end M] (0.035) [--pinch-triangulated] [--pinch-palm-down MAX] (1: off)\n"
                         "          [--grip-begin R] (1.2) [--grip-end R] (1.45) [--gesture-log]\n"
                         "          [--contrast MODE|PALM/HAND] (clahe[:CLIP], none, stretch; default clahe:2/none)\n"
                         "Recording saves every frame set for S seconds (120) to DIR/sets.bin, for ft-handreplay; SIGUSR1\n"