Pixel-art mouse pointers and hand actions

- pointing monster hand with the active tool's icon, grabbing hand / fist, animated backhand and punch
- active tool highlighted in the toolbar (pulsing frame, arrow)
- hand: pick up unconscious heroes on own ground, drop prisoners anywhere on own ground
  (onto a free torture place = locked up), Shift+click backhand (speed-up) / punch (stun)
- fix: hint slots overflowed with the new hints; hint times are no longer saved
- test for the hand rules

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

src/sfx.rs

@@ -155,6 +155,8 @@ fn def(s: Sfx, r: f32) -> Vec<f32> {
             seg(Square(0.25), 900.0, 900.0, 0.08, 0.16, 15.0),
         ], 46),
         Sfx::Convert => l(&arp(Saw, &[220.0, 262.0, 330.0, 440.0], 0.1, 0.22), 47),
+        Sfx::Slap => mix(vec![l(&[seg(Noise, 5000.0, 2500.0, 0.06, 0.5, 40.0)], 48), l(&[seg(Square(0.5), 900.0, 500.0, 0.05, 0.12, 30.0)], 49)]),
+        Sfx::Punch => mix(vec![l(&[seg(Tri, 160.0, 60.0, 0.15, 0.8, 18.0)], 50), l(&[seg(Noise, 3000.0, 800.0, 0.08, 0.4, 30.0)], 51)]),
     }
 }