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>

README.md

@@ -51,7 +51,8 @@ The soundtrack consists of FastTracker 2 modules in `assets/music/`, generated b
 |---|---|
 | Esc | Pause menu (save, load, settings) |
 | Left click / drag | Use the active tool (dig and rooms: drag a rectangle) |
-| Right click | Drop a unit from your hand |
+| Right click | Drop a unit from your hand (prisoners anywhere on your ground; onto a free torture place = locked up) |
+| Shift + left click (hand) | Backhand own units (15 s faster, costs a little HP and mood) / punch heroes on your ground (15 damage, 1 s stun) |
 | Right drag, WASD, arrows, screen edge | Move the camera |
 | Middle drag, Q/E, R/F | Rotate / tilt the camera |
 | Mouse wheel | Zoom |