feat: add IsActionInRange, GetActionInfo, and GetActionCount Lua API

IsActionInRange(slot) checks if the spell on an action bar slot is within
range of the current target, using DBC spell range data and entity positions.
Returns 1/0/nil matching the WoW API contract.

GetActionInfo(slot) returns action type ("spell"/"item"/"macro"), id, and
subType for action bar interrogation by bar addons.

GetActionCount(slot) returns item stack count across backpack and bags for
consumable tracking on action bars.

src/addons/lua_engine.cpp

@@ -2919,6 +2919,115 @@ static int lua_IsUsableAction(lua_State* L) {
     return 2;
 }
 
+// IsActionInRange(slot) → 1 if in range, 0 if out, nil if no range check applicable
+static int lua_IsActionInRange(lua_State* L) {
+    auto* gh = getGameHandler(L);
+    if (!gh) { lua_pushnil(L); return 1; }
+    int slot = static_cast<int>(luaL_checknumber(L, 1)) - 1;
+    const auto& bar = gh->getActionBar();
+    if (slot < 0 || slot >= static_cast<int>(bar.size()) || bar[slot].isEmpty()) {
+        lua_pushnil(L);
+        return 1;
+    }
+    const auto& action = bar[slot];
+    uint32_t spellId = 0;
+    if (action.type == game::ActionBarSlot::SPELL) {
+        spellId = action.id;
+    } else {
+        // Items/macros: no range check for now
+        lua_pushnil(L);
+        return 1;
+    }
+    if (spellId == 0) { lua_pushnil(L); return 1; }
+
+    auto data = gh->getSpellData(spellId);
+    if (data.maxRange <= 0.0f) {
+        // Melee or self-cast spells: no range indicator
+        lua_pushnil(L);
+        return 1;
+    }
+
+    // Need a target to check range against
+    uint64_t targetGuid = gh->getTargetGuid();
+    if (targetGuid == 0) { lua_pushnil(L); return 1; }
+    auto targetEnt = gh->getEntityManager().getEntity(targetGuid);
+    auto playerEnt = gh->getEntityManager().getEntity(gh->getPlayerGuid());
+    if (!targetEnt || !playerEnt) { lua_pushnil(L); return 1; }
+
+    float dx = playerEnt->getX() - targetEnt->getX();
+    float dy = playerEnt->getY() - targetEnt->getY();
+    float dz = playerEnt->getZ() - targetEnt->getZ();
+    float dist = std::sqrt(dx*dx + dy*dy + dz*dz);
+    lua_pushnumber(L, dist <= data.maxRange ? 1 : 0);
+    return 1;
+}
+
+// GetActionInfo(slot) → actionType, id, subType
+static int lua_GetActionInfo(lua_State* L) {
+    auto* gh = getGameHandler(L);
+    if (!gh) { return 0; }
+    int slot = static_cast<int>(luaL_checknumber(L, 1)) - 1;
+    const auto& bar = gh->getActionBar();
+    if (slot < 0 || slot >= static_cast<int>(bar.size()) || bar[slot].isEmpty()) {
+        return 0;
+    }
+    const auto& action = bar[slot];
+    switch (action.type) {
+        case game::ActionBarSlot::SPELL:
+            lua_pushstring(L, "spell");
+            lua_pushnumber(L, action.id);
+            lua_pushstring(L, "spell");
+            return 3;
+        case game::ActionBarSlot::ITEM:
+            lua_pushstring(L, "item");
+            lua_pushnumber(L, action.id);
+            lua_pushstring(L, "item");
+            return 3;
+        case game::ActionBarSlot::MACRO:
+            lua_pushstring(L, "macro");
+            lua_pushnumber(L, action.id);
+            lua_pushstring(L, "macro");
+            return 3;
+        default:
+            return 0;
+    }
+}
+
+// GetActionCount(slot) → count (item stack count or 0)
+static int lua_GetActionCount(lua_State* L) {
+    auto* gh = getGameHandler(L);
+    if (!gh) { lua_pushnumber(L, 0); return 1; }
+    int slot = static_cast<int>(luaL_checknumber(L, 1)) - 1;
+    const auto& bar = gh->getActionBar();
+    if (slot < 0 || slot >= static_cast<int>(bar.size()) || bar[slot].isEmpty()) {
+        lua_pushnumber(L, 0);
+        return 1;
+    }
+    const auto& action = bar[slot];
+    if (action.type == game::ActionBarSlot::ITEM && action.id != 0) {
+        // Count items across backpack + bags
+        uint32_t count = 0;
+        const auto& inv = gh->getInventory();
+        for (int i = 0; i < inv.getBackpackSize(); ++i) {
+            const auto& s = inv.getBackpackSlot(i);
+            if (!s.empty() && s.item.itemId == action.id)
+                count += (s.item.stackCount > 0 ? s.item.stackCount : 1);
+        }
+        for (int b = 0; b < game::Inventory::NUM_BAG_SLOTS; ++b) {
+            int bagSize = inv.getBagSize(b);
+            for (int i = 0; i < bagSize; ++i) {
+                const auto& s = inv.getBagSlot(b, i);
+                if (!s.empty() && s.item.itemId == action.id)
+                    count += (s.item.stackCount > 0 ? s.item.stackCount : 1);
+            }
+        }
+        lua_pushnumber(L, count);
+    } else {
+        lua_pushnumber(L, 0);
+    }
+    return 1;
+}
+
 // GetActionCooldown(slot) → start, duration, enable
 static int lua_GetActionCooldown(lua_State* L) {
     auto* gh = getGameHandler(L);
@@ -3655,6 +3764,9 @@ void LuaEngine::registerCoreAPI() {
         {"GetActionTexture",    lua_GetActionTexture},
         {"IsCurrentAction",     lua_IsCurrentAction},
         {"IsUsableAction",      lua_IsUsableAction},
+        {"IsActionInRange",     lua_IsActionInRange},
+        {"GetActionInfo",       lua_GetActionInfo},
+        {"GetActionCount",      lua_GetActionCount},
         {"GetActionCooldown",   lua_GetActionCooldown},
         {"UseAction",           lua_UseAction},
         {"CancelUnitBuff",      lua_CancelUnitBuff},