Changelog improvements (#18498)

* Changelog improvements

* Farie tweaks

* Fix

* Improvements

code/modules/client/preference/preferences.dm

@@ -61,6 +61,7 @@ GLOBAL_LIST_INIT(special_role_times, list( //minimum age (in days) for accounts
 
 	//game-preferences
 	var/lastchangelog = "1"				//Saved changlog timestamp (unix epoch) to detect if there was a change. Dont set this to 0 unless you want the last changelog date to be 4x longer than the expected lifespan of the universe.
+	var/lastchangelog_2 = "1" // Clone of the above var for viewing changes since last connection. This is never overriden. Yes it needs to exist.
 	var/exp
 	var/ooccolor = "#b82e00"
 	var/list/be_special = list()				//Special role selection

code/modules/client/preference/preferences_mysql.dm

@@ -27,6 +27,8 @@
 		colourblind_mode = query.item[21]
 		keybindings = init_keybindings(raw = query.item[22])
 
+	lastchangelog_2 = lastchangelog // Clone please
+
 	//Sanitize
 	ooccolor		= sanitize_hexcolor(ooccolor, initial(ooccolor))
 	UI_style		= sanitize_inlist(UI_style, list("White", "Midnight", "Plasmafire", "Retro", "Slimecore", "Operative"), initial(UI_style))