Refactor touch zone functions to utilize shared UI helpers

inventoryManager.lua

@@ -659,50 +659,23 @@ end
 -- Get items filtered by search query
 local function getFilteredItems()
     ensureItemList()
-    local filtered = {}
-    for _, item in ipairs(cache.itemList) do
-        if searchQuery == "" then
-            table.insert(filtered, item)
-        else
-            local lower = item.name:lower():gsub("minecraft:", ""):gsub("_", " ")
-            if lower:find(searchQuery:lower(), 1, true) then
-                table.insert(filtered, item)
-            end
-        end
-    end
-    return filtered
+    return ui.getFilteredItems(cache.itemList, searchQuery)
 end
 
 local function addZone(x1, y1, x2, y2, action, data)
-    table.insert(pendingZones, {
-        x1 = x1, y1 = y1, x2 = x2, y2 = y2,
-        action = action, data = data
-    })
+    ui.addZone(pendingZones, x1, y1, x2, y2, action, data)
 end
 
 local function hitTest(x, y)
-    for _, zone in ipairs(touchZones) do
-        if x >= zone.x1 and x <= zone.x2 and y >= zone.y1 and y <= zone.y2 then
-            return zone.action, zone.data
-        end
-    end
-    return nil, nil
+    return ui.hitTest(touchZones, x, y)
 end
 
 local function addSmelterZone(x1, y1, x2, y2, action, data)
-    table.insert(smelterPendingZones, {
-        x1 = x1, y1 = y1, x2 = x2, y2 = y2,
-        action = action, data = data
-    })
+    ui.addZone(smelterPendingZones, x1, y1, x2, y2, action, data)
 end
 
 local function smelterHitTest(x, y)
-    for _, zone in ipairs(smelterTouchZones) do
-        if x >= zone.x1 and x <= zone.x2 and y >= zone.y1 and y <= zone.y2 then
-            return zone.action, zone.data
-        end
-    end
-    return nil, nil
+    return ui.hitTest(smelterTouchZones, x, y)
 end
 
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