feat(frontend): remote actor lookup and follow from search page

thoughts-frontend/lib/api.ts

@@ -15,6 +15,14 @@ export const UserSchema = z.object({
 
 export const MeSchema = UserSchema;
 
+export const RemoteActorSchema = z.object({
+  handle: z.string(),
+  displayName: z.string().nullable(),
+  avatarUrl: z.string().nullable(),
+  url: z.string(),
+});
+export type RemoteActor = z.infer<typeof RemoteActorSchema>;
+
 export const ThoughtSchema = z.object({
   id: z.string().uuid(),
   content: z.string(),
@@ -208,6 +216,22 @@ export const followUser = (username: string, token: string) =>
 export const unfollowUser = (username: string, token: string) =>
   apiFetch(`/users/${username}/follow`, { method: "DELETE" }, z.null(), token);
 
+export const lookupRemoteActor = (handle: string, token: string | null) =>
+  apiFetch(
+    `/federation/lookup?handle=${encodeURIComponent(handle)}`,
+    {},
+    RemoteActorSchema,
+    token
+  );
+
+export const followRemoteUser = (handle: string, token: string) =>
+  apiFetch(
+    `/federation/follow`,
+    { method: "POST", body: JSON.stringify({ handle }) },
+    z.null(),
+    token
+  );
+
 export const getAllUsers = (page: number = 1, pageSize: number = 20) =>
   apiFetch(
     `/users?page=${page}&per_page=${pageSize}`,