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>

lang/en.lang

@@ -141,7 +141,8 @@ ui.pause_hint = P: continue
 # ---- help
 help.goal = Goal: destroy the Hero Gate and protect your Soul Core.
 help.k_left = Left click      Use tool (dig/rooms: drag a rectangle)
-help.k_right = Right click     Drop a unit from your hand
+help.k_right = Right click     Drop a unit (prisoners: also into the torture chamber)
+help.k_slap = Shift+Left      Hand: backhand own units, punch heroes on your ground
 help.k_pan = Right drag      Move the map (also WASD/arrows, screen edge)
 help.k_rot = Middle drag     Rotate and tilt the camera (also Q/E, R/F)
 help.k_zoom = Mouse wheel     Zoom
@@ -337,3 +338,6 @@ dir.nw = north-west
 
 val.auto = Auto ({0}x)
 set.render_scale = 3D resolution
+
+hint.pickup_prisoner_where = Prisoners can only be picked up on your own territory.
+hint.punch_where = The hand can only punch heroes on your own territory.