feat(mods): expose battle UI visibility hooks

src/render/TextBox.lua

@@ -7,11 +7,13 @@
 -- the text is exhausted and A is pressed, then calls onDone.
 
 local Font = require("src.render.Font")
+local Runtime = require("src.mods.Runtime")
 local Theme = require("src.ui.Theme")
 local Timing = require("src.core.Timing")
 
 local TextBox = {}
 TextBox.__index = TextBox
+TextBox.isTextBox = true
 
 -- theme-free fallbacks; geometry resolves against Theme.textBox at
 -- construction time, so an unthemed boot stays byte-identical
@@ -344,6 +346,11 @@ function TextBox:update(dt)
 end
 
 function TextBox:draw()
+  if Runtime.wantsHook("battle.bottom_ui_visible")
+      and Runtime.call("battle.bottom_ui_visible", function() return true end,
+                       self) == false then
+    return
+  end
   -- The dialogue box belongs against the bottom of the screen, not floating
   -- in the middle of a zoomed-out letterbox.  Declared per frame; the
   -- renderer blits this region to the screen edge and the rest of the UI