fix: call enable() on pages after attaching to device

Opus Canvas only renders children with enabled=true. Without
calling page:enable(), all widgets were skipped during render,
resulting in a blank black monitor.

manager/display.lua

@@ -450,6 +450,7 @@ local function buildMainPage()
     mainDevice.currentPage = mainPage
     mainPage.parent = mainDevice
     mainPage:setParent()
+    mainPage:enable()
 end
 
 function D.updateAmountButtons()
@@ -886,6 +887,7 @@ local function buildSmelterPage()
     smelterDevice.currentPage = smelterPage
     smelterPage.parent = smelterDevice
     smelterPage:setParent()
+    smelterPage:enable()
 end
 
 -------------------------------------------------
@@ -1015,12 +1017,7 @@ end
 function D.drawDashboard()
     if not mainPage then
         if mainDevice then
-            log.info("DRAW", "Building main page (device=%s, side=%s)",
-                tostring(mainDevice), tostring(mainDevice and mainDevice.device and mainDevice.device.side or "nil"))
             buildMainPage()
-            log.info("DRAW", "Main page built: %s", tostring(mainPage ~= nil))
-        else
-            log.warn("DRAW", "No mainDevice — skipping dashboard")
         end
         if not mainPage then return end
     end
@@ -1042,21 +1039,6 @@ function D.drawDashboard()
     -- Draw everything
     mainPage:draw()
     mainDevice:sync()
-
-    -- Debug: verify monitor is writable
-    if D._drawCount == nil then D._drawCount = 0 end
-    D._drawCount = D._drawCount + 1
-    if D._drawCount <= 3 then
-        log.info("DRAW", "sync complete (draw #%d, lines=%d, w=%d h=%d)",
-            D._drawCount,
-            mainDevice.lines and #mainDevice.lines or -1,
-            mainDevice.width or -1, mainDevice.height or -1)
-        -- Raw write test directly to the physical monitor
-        D.mon.setCursorPos(1, 1)
-        D.mon.setBackgroundColor(colors.red)
-        D.mon.setTextColor(colors.white)
-        D.mon.write("DRAW TEST #" .. D._drawCount)
-    end
 end
 
 function D.drawSmelterDashboard()