feat(demo): add Live Activity delivery tracker example

[nan-li]

Description

One Line Summary

Add a delivery order tracking Live Activity using DefaultLiveActivityAttributes with setupDefault + startDefault flow. Includes the iOS widget extension (lock screen, Dynamic Island, progress bar), React Native UI section with delivery-themed inputs, and setupDefault call at app init.

Details

Motivation

Demo L.A.

Scope

Demo app only

Testing

Unit testing

OPTIONAL - Explain unit tests added, if not clear in the code.

Manual testing

Push-to-update example payload (send via OneSignal REST API):

  POST https://api.onesignal.com/apps/{app_id}/live_activities/{activity_id}/notifications
  {
    "event": "update",
    "event_updates": {
      "data": {
        "status": "on_the_way",
        "message": "Driver is heading your way",
        "estimatedTime": "10 min"
      }
    },
    "name": "Delivery Update"
  }

To mark delivered:
"event_updates": {
  "data": {
    "status": "delivered",
    "message": "Order delivered!",
    "estimatedTime": ""
  }
}

Affected code checklist

• Notifications
  • Display
  • Open
  • Push Processing
  • Confirm Deliveries
• Outcomes
• Sessions
• In-App Messaging
• REST API requests
• Public API changes

Checklist

Overview

• I have filled out all REQUIRED sections above
• PR does one thing
  • If it is hard to explain how any codes changes are related to each other then it most likely needs to be more than one PR
• Any Public API changes are explained in the PR details and conform to existing APIs

Testing

• I have included test coverage for these changes, or explained why they are not needed
• All automated tests pass, or I explained why that is not possible
• I have personally tested this on my device, or explained why that is not possible

Final pass

• Code is as readable as possible.
  • Simplify with less code, followed by splitting up code into well named functions and variables, followed by adding comments to the code.
• I have reviewed this PR myself, ensuring it meets each checklist item
  • WIP (Work In Progress) is ok, but explain what is still in progress and what you would like feedback on. Start the PR title with "WIP" to indicate this.

[fadi-george]

I'll remake the pr with more features.