fix: keyboard overlay hidden behind bottom bars due to z-order

Opus initChildren uses pairs() which has non-deterministic ordering.
The keyboard overlay occupies the same screen space as alertBar,
footerBar, and bottomBar. If those bars end up later in the children
array, they render on top and hide the keyboard.

Added raise() after enabling the keyboard to move it to the end
of the children array, ensuring it renders on top.

manager/display.lua

@@ -290,6 +290,7 @@ local function buildMainPage()
                     local page = self.parent
                     if showKeyboard then
                         UI.Window.enable(page.keyboard)
+                        page.keyboard:raise()
                         page.keyboard:draw()
                     else
                         page.keyboard:disable()