Make the @as casts actually apply

emmylua only parses the inline cast as `--[[@as T]]`, the spaced form
`--[[ @as T ]]` is treated as a plain comment, so all 149 of them were
doing nothing.

LuaGuiElement.style is a union because a style name can be assigned to
it, so reading it back needs the cast.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

exp_scenario/module/commands/waterfill.lua

@@ -36,7 +36,7 @@ commands.waterfill = Commands.new("waterfill", { "exp-commands_waterfill.descrip
             SelectArea:start(player)
             return Commands.status.success{ "exp-commands_waterfill.enter" }
         end
-    end) --[[ @as any ]]
+    end) --[[@as any]]
 
 --- When an area is selected to be converted to water
 SelectArea:on_selection(function(event)