fix(preprocess): add missing --spice-main-elevated

Author: rxri

src/preprocess/preprocess.go

@@ -305,6 +305,13 @@ func colorVariableReplace(content string) string {
 				return "var(--spice-card)"
 			},
 		},
+		{
+			Name:  "CSS: --spice-main-elevated",
+			Regex: "#(242424|1f1f1f)",
+			Replacement: func(submatches ...string) string {
+				return "var(--spice-main-elevated)"
+			},
+		},
 		{
 			Name:  "CSS: --spice-main",
 			Regex: "#121212",