Shared chest tabs, rune stacks and rune master, Q pickup, Kettenblitz tooltip and range

- Shared chest: tabs "Truhe"/"Gemeinsam" as a column left of the grid
  (game tab sheet), grids placed every tick, persistent across heroes
- Inventory tab texts capitalized (RegisterText / CapitalizeText)
- Combat-art runes stack like potions (itemstack, renamed from potionstack)
- Rune master: any rune for any number of runes, price by rune count
  (4 runes = 1,000, x10 per missing rune), bought rune goes into the
  backpack, Buy disabled without runes, gold or room, last rune remembered
  per hero (saved), the chosen rune's name below its icon, dropping a
  stack gives up one rune
- Keys: the old key handling no longer takes over after the save screen
  (text field focus only counts while its dialog is shown)
- Esc crash: tooltips forgotten when the game destroys them
- Pick up (Q) sends the pickup order directly; search reach doubled
- Kettenblitz: tooltip shows hits per chain, chains, cast and jump range;
  cast range 900 (longer ray segments), jumps half of that

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

docs/todo.md

@@ -119,7 +119,7 @@ in-game texts/tooltips that name the old keys):
 | Key | Action | Temporary key (sacred_re.ini) |
 |---|---|---|
 | W | action slot 3 (`cEngine::UseActionSlot`, like Q/E/R/B/Space) | G (`[keys] ActionSlot3`) |
-| A | pick up items nearby (creature event 0x113) | V (`[keys] PickUp`) |
+| A | pick up items nearby (creature event 0x113) | Q (`[keys] PickUp`, 2026-10-17; was V) |
 | S | save game window (`UI_WND_SAVEGAME`) | K (`[keys] SaveGame`) |
 | D | unbound | - |
 
@@ -133,4 +133,4 @@ Asked 2026-10-17 (after the potion counts on the bottom bar,
 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/potion-stacks.md (open: sale price per stack, splitting on the ground).
+docs/item-stacks.md (open: sale price per stack, splitting on the ground).