feat(workbench): persist topbar notification state

web/src/services/notificationStates.js

@@ -0,0 +1,38 @@
+import { apiRequest } from './api.js'
+
+function normalizeStateItem(item) {
+  const notificationId = String(item?.notification_id || item?.notificationId || '').trim()
+  if (!notificationId) {
+    return null
+  }
+
+  return {
+    notification_id: notificationId,
+    read: Boolean(item?.read),
+    hidden: Boolean(item?.hidden),
+    context_json: item?.context_json && typeof item.context_json === 'object'
+      ? item.context_json
+      : {}
+  }
+}
+
+export async function fetchNotificationStates() {
+  const payload = await apiRequest('/notification-states')
+  return Array.isArray(payload?.states) ? payload.states : []
+}
+
+export async function patchNotificationStates(states = []) {
+  const normalizedStates = (Array.isArray(states) ? states : [])
+    .map(normalizeStateItem)
+    .filter(Boolean)
+
+  if (!normalizedStates.length) {
+    return []
+  }
+
+  const payload = await apiRequest('/notification-states', {
+    method: 'POST',
+    body: JSON.stringify({ states: normalizedStates })
+  })
+  return Array.isArray(payload?.states) ? payload.states : []
+}