feat(astrodark): refactor main UI background colors

also added a status palette, not sure if this will stay or go later.

Author: A-Lamia

lua/astrotheme/palettes/astrodark.lua

@@ -17,8 +17,9 @@ local colors = {
   alt_orange = "#ff9640",
   -------------------
   base = "#1e222a",
-  crust = "#1f1f25",
-  mantle = "#181a1f",
+  mantle = "#191C21", -- tools
+  crust = "#15181D", -- tabline
+  status = "#15181D", -- statusline
   -------------------
   surface0 = "#252931",
   surface1 = "#3e4452",