Give Avatar initials, person-mark, and load-error fallbacks so missing photos still look like the design-system atom.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/propNormalization.ts

@@ -245,3 +245,17 @@ export const PROPORTION_BAR_VARIANT_OPTIONS = [
 ] as const;
 export type ProportionBarVariantValue =
   (typeof PROPORTION_BAR_VARIANT_OPTIONS)[number];
+
+export const AVATAR_SIZE_OPTIONS = [
+  "small",
+  "medium",
+  "large",
+  "xlarge",
+] as const;
+export type AvatarSizeValue = (typeof AVATAR_SIZE_OPTIONS)[number];
+
+export const AVATAR_SHAPE_OPTIONS = ["circle", "rounded-square"] as const;
+export type AvatarShapeValue = (typeof AVATAR_SHAPE_OPTIONS)[number];
+
+export const AVATAR_VARIANT_OPTIONS = ["filled", "outlined"] as const;
+export type AvatarVariantValue = (typeof AVATAR_VARIANT_OPTIONS)[number];