Teleportationstrank: yellow potions open the portal window

- Every yellow potion (potion kind 5, all stages) is a Teleportationstrank:
  drinking it posts the teleporter's event to the busy dialog with the
  hero's known portals; the potion is used up only when the hero teleports
  from that window (closing it keeps the potion)
- Names replaced in every game text (ReplaceInTexts), so item names and the
  bottom bar's quick-select tooltip read Teleportationstrank; GameText reads
  the game's own text
- HeroIndex / HeroInventory moved to skillslots for shared use
- docs/teleport-potion.md; walking animation after loading noted in todo

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/todo.md

@@ -134,3 +134,10 @@ stack in one inventory cell, up to 20 per stack (a full stack starts a new
 one). Drag, sell and drop move the whole stack, as with any other item. The
 counts on the potion slots then add up the stacks. In progress, see
 docs/item-stacks.md (open: sale price per stack, splitting on the ground).
+
+## Walking animation after loading (2026-10-17)
+
+The hero sometimes plays a walking animation after a save game load while
+standing still. Not reproduced yet: a load log (hero mode, action, animation
+fields, orders) showed nothing unusual; right after a load the game itself
+sends one walk order (0x4) while the hero is idle. Measure again when it shows.