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/tracker/lab/eyes_track.py

@@ -1,41 +0,0 @@
-"""Per-frame pupil ellipses through a recording, cached in the capture (numbers only).
-
-ellipses(cap) -> {camera: array of rows (t, x, y, a, b, major, fill, glint mid x, y)}, every
-EVERY-th frame of each camera; the glint midpoint is NaN when the pair isn't seen.
-"""
-import numpy as np
-
-import eyes_lab  # noqa: F401  (puts gaze/tracker on the path)
-import eyes_pupil
-
-EVERY = 2
-VERSION = 2
-
-
-def load_index(cap):
-    return np.array([[float(v) for v in l.split()]
-                     for l in (cap / "index.txt").read_text().splitlines() if len(l.split()) == 4])
-
-
-def ellipses(cap):
-    cache = cap / f"ellipses-v{VERSION}.npz"
-    if cache.exists():
-        z = np.load(cache)
-        return {0: z["cam0"], 1: z["cam1"]}
-    idx = load_index(cap)
-    frames = np.memmap(cap / "frames.raw", dtype=np.uint8, mode="r").reshape(-1, 400, 512)
-    idx = idx[:len(frames)]
-    out = {}
-    for c in (0, 1):
-        rows, prev = [], None
-        for i in np.where(idx[:, 2] == c)[0][::EVERY]:
-            p = eyes_pupil.find_pupil(frames[i], prev)
-            prev = p
-            if p is None:
-                continue
-            pair = eyes_pupil.glint_pair(p)
-            mx, my = ((pair[0][0] + pair[1][0]) / 2, (pair[0][1] + pair[1][1]) / 2) if pair else (np.nan, np.nan)
-            rows.append((idx[i, 3], p["x"], p["y"], p["a"], p["b"], p["major"], p["fill"], mx, my))
-        out[c] = np.array(rows).reshape(-1, 9)
-    np.savez(cache, cam0=out[0], cam1=out[1])
-    return out