Feature Request: Push Notification for New Messages using FCM

[Alpha17-2]

Description

Implement a feature that sends a push notification to a user when they receive a new message from another user. This will use Firebase Cloud Messaging (FCM) to deliver the notifications. The notification should include the sender's name and a preview of the message content.

Requirements

1. FCM Integration:

   • Integrate Firebase Cloud Messaging (FCM) to send push notifications.
   • Ensure FCM tokens are stored and managed for each user.

2. Trigger Notification:

   • Trigger a notification when a new message is sent.
   • Fetch the recipient's FCM token from the database.

3. Notification Content:

   • The notification should include the sender's name.
   • A preview of the message content should be displayed.

4. Handle Notification:

   • Ensure the app can handle incoming notifications.
   • Clicking on the notification should navigate the user to the relevant chat screen.

Implementation Details

1. Store FCM Tokens:

   • Update the user profile creation and login flows to capture and store the FCM token for each user.

2. Send Notification on New Message:

   • Modify the message sending logic to include a step that sends a notification to the recipient.
   • Use the stored FCM token to send the notification via Firebase Cloud Messaging.

3. Notification Payload:

   • Create a payload structure that includes the sender's name and a message preview.

4. App Notification Handling:

   • Update the app to handle incoming notifications.
   • Ensure the app navigates to the correct chat screen when a notification is clicked.

Steps to Reproduce

1. User A sends a message to User B.
2. User B should receive a push notification on their device with the message content and sender's name.
3. Clicking on the notification should open the app and navigate to the chat screen with User A.