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>

DESIGN.md

@@ -63,7 +63,8 @@ An original dungeon management game (genre: dungeon building & defence) that run
 - The Soul Core starts surrounded by a **one tile wide ring of treasury** (16 tiles)
 - Claim the **portal** → creatures: kobold, cave spider, shadow mage, stone ogre (depending on rooms)
 - **Needs**: sleep, food, wages (payday); unhappy creatures leave
-- **Hand**: pick up / drop own units (max. 8)
+- **Hand**: left click picks up own units (max. 8) and unconscious heroes on own ground; right click drops them on own ground (prisoners onto a free torture place are locked up); Shift + left click slaps: backhand for own units (15 s +50% speed, −5% HP, a little mood, wakes sleepers), fist for heroes on own ground (15 damage, 1 s stun, 0.5 s cooldown)
+- **Pixel-art mouse pointers**: pointing monster hand with the icon of the active tool; grabbing hand / fist for the hand tool; animated backhand and punch; the active tool is highlighted in the toolbar (pulsing frame and arrow)
 - **Spells** (mana): lightning, heal, summon Pit Imp
 - **Heroes**: knight, archer, priest, dwarf miner, paladin of light (they dig their way to the Soul Core)