v1 review pass: fixed some minor bugs

src/model.ts

@@ -48,6 +48,32 @@ export interface PublicUser {
   avatarMime?: string;
 }
 
+// Wire types — createdAt arrives as an ISO string from API/WS/localStorage
+type WithStringDate<T extends { createdAt: Date }> = Omit<T, "createdAt"> & {
+  createdAt: string;
+};
+export type RawDump = WithStringDate<Dump>;
+export type RawUser = WithStringDate<User>;
+export type RawPublicUser = WithStringDate<PublicUser>;
+export type RawAuthResponse = Omit<AuthResponse, "user"> & { user: RawUser };
+
+// Deserializers — convert wire types to domain types at API/WS/localStorage boundaries
+export function deserializeDump(raw: RawDump): Dump {
+  return { ...raw, createdAt: new Date(raw.createdAt) };
+}
+
+export function deserializeUser(raw: RawUser): User {
+  return { ...raw, createdAt: new Date(raw.createdAt) };
+}
+
+export function deserializePublicUser(raw: RawPublicUser): PublicUser {
+  return { ...raw, createdAt: new Date(raw.createdAt) };
+}
+
+export function deserializeAuthResponse(raw: RawAuthResponse): AuthResponse {
+  return { ...raw, user: deserializeUser(raw.user) };
+}
+
 export interface LoginUserRequest {
   username: string;
   password: string;