feat: chat

lib/social.ts

@@ -168,6 +168,13 @@ export type RelationshipState = {
   blocked: boolean;
   /** they have blocked you. */
   blocked_by: boolean;
+  /** Whether the viewer may START a conversation with this profile. Reflects
+   *  the target's "who can message you" setting and any block, so the Message
+   *  button is only offered when tapping it would actually work. */
+  can_message: boolean;
+  /** The target's rule when `can_message` is false — one of "blocked",
+   *  "friends", "account_age", "same_gender" — so the UI can explain why. */
+  message_restriction?: string;
 };
 
 /** Returned by every relationship mutation: the recomputed state plus