Create flow: session UI + sign out

app/create/anonymousDraftStorage.ts

@@ -0,0 +1,91 @@
+import type { CreateFlowState } from "./types";
+
+/** Anonymous in-progress create flow (local only until magic-link transfer). */
+export const CREATE_FLOW_ANONYMOUS_KEY = "create-flow-anonymous" as const;
+
+/**
+ * Set when the user submits magic link from “Save your progress?” so after verify we PUT to server.
+ * Value is arbitrary truthy string; cleared after successful transfer or abandon.
+ */
+export const CREATE_FLOW_TRANSFER_PENDING_KEY =
+  "create-flow-transfer-pending" as const;
+
+const LEGACY_LIVE_KEY = "create-flow-state";
+const LEGACY_DRAFT_KEY = "create-flow-draft";
+
+export function readAnonymousCreateFlowState(): CreateFlowState {
+  if (typeof window === "undefined") return {};
+  try {
+    const raw = window.localStorage.getItem(CREATE_FLOW_ANONYMOUS_KEY);
+    if (!raw) return {};
+    const parsed = JSON.parse(raw) as CreateFlowState;
+    return typeof parsed === "object" && parsed !== null ? parsed : {};
+  } catch {
+    return {};
+  }
+}
+
+export function writeAnonymousCreateFlowState(value: CreateFlowState): void {
+  if (typeof window === "undefined") return;
+  try {
+    window.localStorage.setItem(
+      CREATE_FLOW_ANONYMOUS_KEY,
+      JSON.stringify(value),
+    );
+  } catch {
+    // quota / private mode
+  }
+}
+
+export function clearAnonymousCreateFlowStorage(): void {
+  if (typeof window === "undefined") return;
+  try {
+    window.localStorage.removeItem(CREATE_FLOW_ANONYMOUS_KEY);
+    window.localStorage.removeItem(CREATE_FLOW_TRANSFER_PENDING_KEY);
+  } catch {
+    // ignore
+  }
+}
+
+export function setTransferPendingFlag(): void {
+  if (typeof window === "undefined") return;
+  try {
+    window.localStorage.setItem(CREATE_FLOW_TRANSFER_PENDING_KEY, "1");
+  } catch {
+    // ignore
+  }
+}
+
+export function hasTransferPendingFlag(): boolean {
+  if (typeof window === "undefined") return false;
+  try {
+    return Boolean(
+      window.localStorage.getItem(CREATE_FLOW_TRANSFER_PENDING_KEY),
+    );
+  } catch {
+    return false;
+  }
+}
+
+export function clearTransferPendingFlag(): void {
+  if (typeof window === "undefined") return;
+  try {
+    window.localStorage.removeItem(CREATE_FLOW_TRANSFER_PENDING_KEY);
+  } catch {
+    // ignore
+  }
+}
+
+/** One-time cleanup of pre–anonymous-draft keys. */
+export function clearLegacyCreateFlowKeysOnce(): void {
+  if (typeof window === "undefined") return;
+  try {
+    const done = window.sessionStorage.getItem("create-flow-legacy-cleared");
+    if (done) return;
+    window.localStorage.removeItem(LEGACY_LIVE_KEY);
+    window.localStorage.removeItem(LEGACY_DRAFT_KEY);
+    window.sessionStorage.setItem("create-flow-legacy-cleared", "1");
+  } catch {
+    // ignore
+  }
+}