Constrain context menu to the width of the widest item

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

styles/src/styleTree/contextMenu.ts

@@ -0,0 +1,23 @@
+import Theme from "../themes/common/theme";
+import { shadow, text } from "./components";
+
+export default function contextMenu(theme: Theme) {
+  return {
+    background: "#ff0000",
+    // background: backgroundColor(theme, 300, "base"),
+    cornerRadius: 6,
+    padding: {
+      bottom: 2,
+      left: 6,
+      right: 6,
+      top: 2,
+    },
+    shadow: shadow(theme),
+    item: {
+      label: text(theme, "sans", "secondary", { size: "sm" }),
+    },
+    separator: {
+      background: "#00ff00"
+    }
+  }
+}