Unable to add TOTP secret key longer than 18 characters

### Steps To Reproduce

1. Open the Authenticator app
2. Tap the + icon to add a new entry
3. Tap "Enter key manually"
4. Enter a key longer than 18 characters

### Expected Result

A TOTP entry will be created

### Actual Result

Receive the error message "Key is invalid"

### Screenshots or Videos

_No response_

### Additional Context

A TOTP secret key longer than 18 characters works on the iOS Bitwarden Authenticator app and when using Bitwarden's Integrated Authenticator

### Build Version

2025.6.0

### What server are you connecting to?

US

### Self-host Server Version

_No response_

### Environment Details

-Device: Samsung Galaxy S25+
- Android 15
- One UI 7.0

### Issue Tracking Info

- [x] I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.