Fix mobile account session selection

lib/auth-storage.ts

@@ -66,8 +66,13 @@ export async function readStoredSessionUser(prefix: string): Promise<{
   }
 }
 
-export async function migrateAuthStorage(fromPrefix: string, toPrefix: string): Promise<void> {
+export async function migrateAuthStorage(
+  fromPrefix: string,
+  toPrefix: string,
+  options: { clearSource?: boolean } = {},
+): Promise<void> {
   if (fromPrefix === toPrefix) return;
+  const clearSource = options.clearSource ?? true;
 
   await Promise.all(
     AUTH_STORAGE_SUFFIXES.map((suffix) =>
@@ -75,7 +80,9 @@ export async function migrateAuthStorage(fromPrefix: string, toPrefix: string):
     ),
   );
 
-  await clearAuthStorage(fromPrefix);
+  if (clearSource) {
+    await clearAuthStorage(fromPrefix);
+  }
 }
 
 export async function clearAuthStorage(prefix: string): Promise<void> {
@@ -124,7 +131,11 @@ export async function finalizeAuthenticatedAccount(input: {
     ? authStoragePrefix(input.activeAccountId)
     : GUEST_AUTH_STORAGE_PREFIX;
 
-  await migrateAuthStorage(sourcePrefix, targetPrefix);
+  if (sourcePrefix !== targetPrefix) {
+    await clearAuthStorage(targetPrefix);
+  }
+
+  await migrateAuthStorage(sourcePrefix, targetPrefix, { clearSource: false });
 
   await input.registerAccount({
     instanceUrl: input.apiUrl,