chore: update CHANGELOG for version 0.6.0-alpha, add in-app notification center, and update package dependencies

lib/api/notifications.ts

@@ -0,0 +1,39 @@
+/**
+ * @file Notifications API client
+ */
+
+import apiRequest from './client'
+
+export interface Notification {
+  id: string
+  organization_id: string
+  type: string
+  title: string
+  body?: string
+  read: boolean
+  link_url?: string
+  link_label?: string
+  metadata?: Record<string, unknown>
+  created_at: string
+}
+
+export interface ListNotificationsResponse {
+  notifications: Notification[]
+  unread_count: number
+}
+
+export async function listNotifications(): Promise<ListNotificationsResponse> {
+  return apiRequest<ListNotificationsResponse>('/notifications')
+}
+
+export async function markNotificationRead(id: string): Promise<void> {
+  return apiRequest<void>(`/notifications/${id}/read`, {
+    method: 'PATCH',
+  })
+}
+
+export async function markAllNotificationsRead(): Promise<void> {
+  return apiRequest<void>('/notifications/mark-all-read', {
+    method: 'POST',
+  })
+}