[Bug]: `App Opened` metrics event not fired at first time

### Describe the bug

`App Opened` metrics event not fired at first time

### Expected behavior

Not sure if that's an issue or expected

### Screenshots/Recordings

_No response_

### Steps to reproduce

1. Onboard
2. Enable metrics
3. Land to homepage
4. Check events

### Error messages or log output

```shell

```

### Detection stage

On main branch

### Version

main

### Build type

None

### Browser

Firefox, Chrome

### Operating system

MacOS

### Hardware wallet

_No response_

### Additional context

_No response_

### Severity

_No response_

No source file, test, or entry point is identified. Start by reproducing the onboarding, metrics-enabling, and homepage sequence on the main branch in Firefox or Chrome, then trace whether the `App Opened` event is emitted. Done requires clarifying the expected first-open behavior and verifying the event sequence against that decision.

Written by the indexing model from the issue text.