makes the skin more compatible with 516 for high dpi monitors (#90416)

## About The Pull Request

changes a whole load of crap in the skin to make it a bit more reactive
to sizing changes, and thus to high dpi monitors

this required adding a bunch of splitters - these have a sane preset for
most monitors but if you ever need to edit it, it's hidden under the
chat settings

1920x1080, 100% scaling

![image](https://github.com/user-attachments/assets/d2b54186-2163-4a77-8580-59008bb7ccc6)

4k, 200% scaling
before:

![vraQH3PvmD8nAGcZ@2x](https://github.com/user-attachments/assets/7f66cfe4-a656-447e-a9b3-d8305638f13d)

after:

![1sc22SAu7x8AOU7D@2x](https://github.com/user-attachments/assets/c2c6e90f-e884-41b3-b80a-191d2aee1f8f)

the sliders:


[user-attachments/assets/776730a7-a325-4b3b-8e27-15636828c6d4](https://github.com/user-attachments/assets/776730a7-a325-4b3b-8e27-15636828c6d4)

## Why It's Good For The Game

it makes the game a bit more playable on my laptop

## Changelog

🆑
qol: under the chat settings, you can now press "Adjust UI Sizes" to
drag around some of the panel sizes
fix: the input at the bottom right is no longer so teeny tiny on 516 if
you use a window scaling that is greater than 100%
/🆑

---------

Co-authored-by: harryob <55142896+harryob@users.noreply.github.com>

code/modules/client/client_procs.dm

@@ -541,7 +541,7 @@ GLOBAL_LIST_INIT(blacklisted_builds, list(
 		if(CONFIG_GET(flag/aggressive_changelog))
 			changelog()
 		else
-			winset(src, "infowindow.changelog", "font-style=bold")
+			winset(src, "infobuttons.changelog", "font-style=bold")
 
 	if(ckey in GLOB.clientmessages)
 		for(var/message in GLOB.clientmessages[ckey])