Skills, auto-attack, aura and chain lightning rework, Esc, cache fix

- Skill bar: no art selection; slot 0 is the right-click art, keys 0-6 cast
  slots directly; cooldown labels in exact seconds; slot 0 set apart.
- Arts regenerate on their own (casting no longer refills the group).
- Auto-attack after targeting or casting at a hostile creature, at the speed
  of a held button.
- Auras can be recast while active (renew, no second visual).
- Blicke wie Klingen hits every enemy in range, physical, with life leech.
- Blitzschlag steers the game's own chain: 3 + level/5 hits, 1 + level/10
  chains, re-hits a lone enemy.
- Weapon sets: click selects, drag only from the selected set; the leftmost
  set is clickable (signed hit tests).
- Esc closes open windows before opening the game menu.
- HUD: standalone buttons and texts are centred.
- Record cache sized for widened views (town lag while walking).
- Shared game code: orders, fx events, text drawing, cooldowns, effects.

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

docs/escape.md

@@ -0,0 +1,33 @@
+# Esc closes windows first (`src/mods/escape.cpp`)
+
+Asked 2026-10-15: with a dialog open, Esc should close it instead of opening
+the game menu.
+
+## The game (`cUI_Manager::HandleEsc` 0x756ba0, measured 2026-10-15)
+
+On an Esc key event the UI manager (`0x757544`) calls HandleEsc. It knows its
+windows by slot (cUI_Manager dwords): 0x20 taskbar, 0x21 inventory, 0x22
+equipment, 0x23 blacksmith, 0x24 merchant, 0x25 megamap, 0x26 overview map,
+0x27 mercenary (party panel), 0x28 stats, 0x29 console, 0x2a diary (quest
+book), 0x2b savegame, 0x2c ESC menu, 0x2d purchase, 0x2e master, 0x2f options,
+0x30 chest, 0x31 horse, 0x32 network info, 0x33 net portrait, 0x34
+character, 0x35 cube. It closes the ESC menu, the megamap, the quest book, or
+(with 0x21/0x23/0x24/0x2e/0x30 open) the inventory; hides 0x2b / 0x2f;
+otherwise opens the ESC menu. With a trader open only the inventory closed,
+and the trader opened it again.
+
+Closing a window: a cEventUI2 (vtable 0x88edd0, 0x80 bytes: +4 code 0x12,
++8 subtype 5 = hide, names via 0x5904e0: sender at +0x28, window at +0x48 as
+measured in the commands the game sends when a window is closed by its
+button or hotkey; a string at +0x68, 0x423920 / 0x416660) sent to the UI
+manager's event handler (vf00, 0x757120), which routes it by name. Sent to
+the window's own vf10 it was not understood (first version).
+
+## The mod
+
+HandleEsc is hooked: unless the ESC menu is open, every visible window of a
+table (slot, name) gets that hide command, and Esc does nothing else. If none
+is open, the game handles Esc as before.
+
+Not covered: dialogs that are not one of these windows, e.g. quest dialogs
+(standalone buttons and texts in the UI manager, docs/hud.md).