fix: resize pages after re-parenting to monitor device

Page:postInit defaults parent to UI.term (small computer terminal).
Window:postInit then calls setParent() which computes all child
dimensions from that small terminal. When we later re-parent to
the monitor device, the children retain their small dimensions.
Adding resize() before setParent() forces all children to
recompute dimensions from the correct monitor size.

manager/display.lua

@@ -446,9 +446,11 @@ local function buildMainPage()
         btnX = btnX + #tostring(amt) + 4
     end
 
-    -- Attach to device
+    -- Attach to device (must resize to recompute all child dimensions
+    -- from the monitor device, since Page:postInit defaulted to UI.term)
     mainDevice.currentPage = mainPage
     mainPage.parent = mainDevice
+    mainPage:resize()
     mainPage:setParent()
     mainPage:enable()
 end
@@ -886,6 +888,7 @@ local function buildSmelterPage()
     -- Attach to device
     smelterDevice.currentPage = smelterPage
     smelterPage.parent = smelterDevice
+    smelterPage:resize()
     smelterPage:setParent()
     smelterPage:enable()
 end