Add storage capacity bar to monitor dashboard for better inventory management

inventoryManager.lua

@@ -161,6 +161,57 @@ local function drawDashboard()
     monFill(3, colors.lightBlue)
     monCenter(3, string.rep("\140", math.min(w - 4, 60)), colors.cyan, colors.lightBlue)
 
+    -- ===== Storage capacity bar =====
+    -- Count total slots and used slots across all chests (in parallel)
+    local totalSlots = 0
+    local usedSlots = 0
+    local capTasks = {}
+    local capResults = {}
+    for i, chestName in ipairs(chests) do
+        capResults[i] = { total = 0, used = 0 }
+        capTasks[i] = function()
+            local inv = peripheral.wrap(chestName)
+            if inv then
+                local size = inv.size()
+                capResults[i].total = size
+                local contents = inv.list()
+                for _ in pairs(contents) do
+                    capResults[i].used = capResults[i].used + 1
+                end
+            end
+        end
+    end
+    if #capTasks > 0 then
+        parallel.waitForAll(table.unpack(capTasks))
+    end
+    for _, r in ipairs(capResults) do
+        totalSlots = totalSlots + r.total
+        usedSlots  = usedSlots  + r.used
+    end
+    local freeSlots = totalSlots - usedSlots
+    local usedRatio = totalSlots > 0 and (usedSlots / totalSlots) or 0
+
+    local capY = 4
+    monFill(capY, colors.black)
+    local capLabel = string.format(" Storage: %d/%d slots (%d free)", usedSlots, totalSlots, freeSlots)
+    monWrite(2, capY, capLabel, colors.lightGray, colors.black)
+
+    -- Draw capacity bar
+    local barStart = #capLabel + 4
+    local barWidth = w - barStart - 2
+    if barWidth > 4 then
+        local barColor = colors.lime
+        if usedRatio > 0.9 then barColor = colors.red
+        elseif usedRatio > 0.7 then barColor = colors.orange
+        elseif usedRatio > 0.5 then barColor = colors.yellow
+        end
+        monBar(barStart, capY, barWidth, usedRatio, barColor, colors.gray)
+        -- Show percentage on the bar
+        local pctStr = string.format(" %d%% ", math.floor(usedRatio * 100))
+        local pctX = barStart + math.floor(barWidth / 2) - math.floor(#pctStr / 2)
+        monWrite(pctX, capY, pctStr, colors.white, barColor)
+    end
+
     -- ===== Item catalogue =====
     local catalogue = buildCatalogue()
 
@@ -176,7 +227,7 @@ local function drawDashboard()
     table.sort(itemList, function(a, b) return a.total > b.total end)
 
     -- Header row
-    local row = 5
+    local row = 6
     monFill(row, colors.gray)
     monWrite(2, row, "#",     colors.lightGray, colors.gray)
     monWrite(5, row, "Item",  colors.lightGray, colors.gray)