feat: Implement notifications modernization

src/types/notifications.ts

@@ -0,0 +1,78 @@
+/**
+ * Notification Type Definitions
+ * 
+ * Centralized types for notification system.
+ * Follows project patterns for type safety and validation.
+ */
+
+/**
+ * Channel preferences for receiving notifications
+ */
+export interface ChannelPreferences {
+  in_app: boolean;
+  email: boolean;
+  push: boolean;
+  sms: boolean;
+}
+
+/**
+ * Per-workflow notification preferences
+ */
+export interface WorkflowPreferences {
+  [workflowId: string]: boolean;
+}
+
+/**
+ * Notification frequency control settings
+ */
+export interface FrequencySettings {
+  digest: 'realtime' | 'hourly' | 'daily' | 'weekly';
+  max_per_hour: number;
+}
+
+/**
+ * Complete notification preferences structure
+ */
+export interface NotificationPreferences {
+  channelPreferences: ChannelPreferences;
+  workflowPreferences: WorkflowPreferences;
+  frequencySettings: FrequencySettings;
+}
+
+/**
+ * Notification template from database
+ */
+export interface NotificationTemplate {
+  id: string;
+  workflow_id: string;
+  novu_workflow_id: string | null;
+  name: string;
+  description: string | null;
+  category: string;
+  is_active: boolean;
+  created_at: string;
+  updated_at: string;
+}
+
+/**
+ * Subscriber data for Novu
+ */
+export interface SubscriberData {
+  subscriberId: string;
+  email?: string;
+  firstName?: string;
+  lastName?: string;
+  phone?: string;
+  avatar?: string;
+  data?: Record<string, any>;
+}
+
+/**
+ * Notification payload for triggering workflows
+ */
+export interface NotificationPayload {
+  workflowId: string;
+  subscriberId: string;
+  payload: Record<string, any>;
+  overrides?: Record<string, any>;
+}