Improve and extend fieldset_block and examine_block (#88678)

## About The Pull Request
Maked `fieldset_block` and `examine_block` more stylish and neat, also
`fieldset_block` no longer has a centred title.
Renamed `examine_block` to `boxed_message` and adds
`custom_boxed_message` which can be colored.

- AdminPMs, admin tickets and vote results has been wrapped into
`fieldset_block` for comfort and visibility
- Health Analyzer results painted to blue
- Vote notice and tips of the round wrapped to purple
`custom_boxed_message`
- Tooltip text border color, now uses text color, not just white

## Why It's Good For The Game
Demonstration in both themes

<details><summary>Dark</summary>


![image](https://github.com/user-attachments/assets/7175379b-b053-4fb7-bd25-65c744a21c56)

![image](https://github.com/user-attachments/assets/1728e72b-0110-4b81-9d61-8779f5fdc3a0)

![image](https://github.com/user-attachments/assets/5e6f9604-35b8-4840-b6b4-35a68f49a997)

</details>

<details><summary>Light</summary>


![image](https://github.com/user-attachments/assets/6a3d693b-e0dc-4a4b-b4d7-2ded54ce0d67)

![image](https://github.com/user-attachments/assets/c4f5e089-180f-4d13-806a-fa64f01740a3)

![image](https://github.com/user-attachments/assets/a46d52c4-ad37-4637-8cae-c4b00139efc1)

</details>

## Changelog

🆑
qol: AdminPMs, admin tickets, vote results and started vote notification
are now much more visible in the chat.
qol: Boxed messages in chat (like examine), has been restyled.
/🆑

code/modules/admin/topic.dm

@@ -847,7 +847,7 @@
 		exportable_text += "[special_role_description]<br>"
 		exportable_text += ADMIN_FULLMONTY_NONAME(subject)
 
-		to_chat(src.owner, examine_block(exportable_text), confidential = TRUE)
+		to_chat(src.owner, boxed_message(exportable_text), confidential = TRUE)
 
 	else if(href_list["addjobslot"])
 		if(!check_rights(R_ADMIN))