feat: the AI can now point to things through the holopad (#96719)

## About The Pull Request

The AI can now send point clicks through their "camera" to be rendered
by the available holopads.


https://github.com/user-attachments/assets/427ea857-b303-4405-bc2e-91482abcbe29

Normal `point`ing timing applies, though one holopad is limited to
projecting one arrow at a time.

## Why It's Good For The Game

This is a thing I've been thinking about for a while. As the AI is
usually the "AI open" "AI where is [...]" "AI how do I [...]" kinda
role, it would make total sense there to be some way for the AI to point
to things. Didn't think it should be it's own machinery since we already
have way too much wallmount stuff.

## Changelog

🆑
add: AIs can now point to things using holopads
/🆑

code/modules/point/point.dm

@@ -84,6 +84,13 @@
 	pixel_y = old_loc.pixel_y
 	SetInvisibility(set_invis)
 
+/obj/effect/temp_visual/point/holo
+	icon_state = "arrow_large_white"
+
+/obj/effect/temp_visual/point/holo/Initialize(mapload, set_invis = 0)
+	. = ..()
+	makeHologram()
+
 #undef POINT_TIME
 
 /**