Spread the Own tracker's calibration dots over the practice area

Its fit goes wrong past its dots, and the ring (limited by the window's height) never
reached the sides, where frame-eyes' worst practice clicks were. With the Own tracker
the calibration now uses the centre, corners, and side middles of the practice area.

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

gaze/probe/ft-gazeprobe

@@ -1826,9 +1826,20 @@ class Probe(Adw.ApplicationWindow):
     def calib_points(self, rnd):
         """The centre, then six on a ring of `Calibration ring` degrees (as much of it as fits
         in the window), turned 20 degrees per round, and half the size in the middle round,
-        so the fit sees the middle, halfway out, and the edge of your view."""
+        so the fit sees the middle, halfway out, and the edge of your view.
+
+        For the Own tracker: the centre, then the corners and the middle of each side of the
+        area practice targets use, half the size in the middle round. Its fit is quadratic and
+        goes wrong past its dots, and the ring (limited by the window's height) left the sides
+        out: in frame-eyes' practice2 the worst clicks were all past the ring."""
         w, h = self.canvas_size()
         cx, cy = w / 2, h / 2
+        if self.source == "own":
+            s = self.RING_SCALE[rnd]
+            left, right, bottom = cx - (cx - 80) * s, cx + (cx - 80) * s, cy + (cy - 80) * s
+            top = cy - (cy - 150) * s  # clear of the round and dot text at the top
+            return [(cx, cy), (left, top), (cx, top), (right, top), (right, cy), (right, bottom),
+                    (cx, bottom), (left, bottom), (left, cy)]
         r = self.raw.get(self.source)
         px_per_deg = 1 / r[5] if r and r[5] else 32.0
         radius = min(self.w_ring.get_value() * px_per_deg, w / 2 - 60, h / 2 - 60) * self.RING_SCALE[rnd]
@@ -2084,8 +2095,8 @@ class Probe(Adw.ApplicationWindow):
                 cr.arc(x, y, 7, 0, 2 * math.pi)
                 cr.stroke()
         GLib.idle_add(self.area.queue_draw)  # the pulse
-        total = len(self.ROUND_BG) * 7
-        n = c["round"] * 7 + c["index"] + 1
+        total = len(self.ROUND_BG) * len(c["points"])
+        n = c["round"] * len(c["points"]) + c["index"] + 1
         self.text(cr, 60, 70, f"Calibration: round {c['round'] + 1} of 3 ({self.ROUND_NAMES[c['round']]}), dot {n} of {total}",
                   ink, 26)
         hint = "Face the centre dot, look at the highlighted dot, and press. Esc cancels, S skips a dot."