fix(Dialog): Update border style to use dynamic width and background color

Author: dlnr

proprietary/tokens/src/components/ams/dialog.tokens.json

@@ -2,7 +2,7 @@
   "ams": {
     "dialog": {
       "background-color": { "value": "{ams.color.background}" },
-      "border": { "value": "0" },
+      "border": { "value": "{ams.border.width.md} solid {ams.color.background}" },
       "gap": { "value": "{ams.space.md}" },
       "inline-size": { "value": "calc(100% - 2 * {ams.space.grid.md})" },
       "max-block-size": { "value": "calc(100dvh - 2 * {ams.space.grid.md})" },