feat(canvas): add shared workspace access and controls

frontend/src/domain/design.ts

@@ -85,6 +85,60 @@ export type Project = ProjectSummary & {
   messages: AgentMessage[];
 };
 
+export type SharePermission = "private" | "canvas" | "viewer" | "editor" | "owner";
+
+export type ShareCapabilities = {
+  canViewCanvas: boolean;
+  canViewChat: boolean;
+  canEdit: boolean;
+  canManage: boolean;
+};
+
+export type ShareAccess = {
+  permission: Exclude<SharePermission, "private">;
+  source: "owner" | "member" | "link";
+  authenticated: boolean;
+  isOwner: boolean;
+  capabilities: ShareCapabilities;
+};
+
+export type SharePerson = {
+  id: string;
+  userId?: string;
+  name?: string;
+  identifier?: string;
+  avatarUrl?: string;
+  permission: Exclude<SharePermission, "private">;
+  createdAt?: string;
+};
+
+export type ShareVisitor = {
+  id: string;
+  userId?: string;
+  name: string;
+  identifier?: string;
+  avatarUrl?: string;
+  visitCount: number;
+  lastSeenAt: string;
+};
+
+export type ShareSettings = {
+  projectId: string;
+  shareId?: string;
+  linkPermission: Exclude<SharePermission, "owner">;
+  owner: SharePerson;
+  members: SharePerson[];
+  visitorCount: number;
+  updatedAt?: string;
+};
+
+export type ResolveShareResponse = {
+  shareId: string;
+  project: Project;
+  access: ShareAccess;
+  updatedAt: string;
+};
+
 export type QuickAction = {
   id: string;
   label: string;