style(admin): unify text color hierarchy with foundation gray

themes/default.json

@@ -3,9 +3,9 @@
   "tokens": {
     "color.bg.content": "#f5f0e5",
     "color.bg.surface": "#ffffff",
-    "color.fg.primary": "#11372d",
-    "color.fg.secondary": "#6e6759",
-    "color.fg.placeholder": "#999999",
+    "color.fg.primary": "#212121",
+    "color.fg.secondary": "#616161",
+    "color.fg.placeholder": "#757575",
     "color.action.primary": "#164434",
     "color.action.cancel": "#6e6759",
     "color.action.destructive": "#d32f2f",
@@ -92,6 +92,11 @@
     "color.palette.orange-light-1": "#eb5f00",
     "color.palette.orange-dark-1": "#bc4c00",
     "color.palette.orange-dark-2": "#883700",
-    "color.palette.orange-dark-3": "#4f2000"
+    "color.palette.orange-dark-3": "#4f2000",
+    "color.palette.gray-900": "#212121",
+    "color.palette.gray-800": "#424242",
+    "color.palette.gray-700": "#616161",
+    "color.palette.gray-600": "#757575",
+    "color.palette.gray-500": "#9e9e9e"
   }
 }