Self / ally arts cast on the hero when pointed at an enemy

Arts with launch type 2 (buffs, auras, heals) are only valid on allies
or without a target; with an enemy under the cursor the game dropped
the order. Orders of a player hero for such arts lose a non-ally target,
which casts them on the hero. The launch type comes from the art
definition tables (game/engine/arts.h, tools/arttable.mjs).

Also: skill keys check the relocated taskbar slots (all 7), Ghidra
data labels (g_ names in names.txt).

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

src/mods/skillbar.h

@@ -7,4 +7,7 @@ namespace mods::skillbar {
 void SelectSkillSlot(unsigned slot);
 void SelectWeaponSet(unsigned slot);
 
+// Whether the taskbar shows combat-art slot `slot` (unlocked, control exists).
+bool HasSkillSlot(const void* taskbar, unsigned slot);
+
 } // namespace mods::skillbar