Predictions: 'Something went wrong' error when adding funds via QR/HW wallet (OneKey)

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## Description
When attempting to add funds via a QR or hardware wallet in the Predictions feature, a 'Something went wrong' error is returned instead of a graceful unsupported device message. Reproduced using a OneKey hardware wallet on iOS RC build v8.3.0 (6070).

## Steps to Reproduce
1. Add Hardware wallet (OneKey)
2. Import accounts from OneKey device
3. Navigate to Predictions
4. Tap "Add hardware wallet"
5. 'Something went wrong' error appears

## Expected Result
Graceful error handling, as HW wallets are not supported in Predictions. A user-friendly message should indicate that hardware wallets are not supported rather than displaying a generic error.

## Actual Result
A generic 'Something went wrong' error is displayed with no indication that hardware wallets are unsupported in this flow.

**Detection stage**
Release Candidate

**Version**
v8.3.0 (iOS 6070)

**Build type**
RC (Release Candidate)

**Browser**
N/A (iOS app)

**Operating system**
iOS

**Hardware wallet**
OneKey

## Additional context
Issue may also affect QR wallet flows. Not confirmed on software accounts.

## Media

https://github.com/user-attachments/assets/e95c332c-2346-4f72-a85f-d7af116639d6

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*Filed via Claude bug reporter*

Start by reproducing the Predictions “Add hardware wallet” flow on the iOS RC build with a OneKey device, then trace the error from that entry point. Done means unsupported hardware-wallet use shows a user-friendly message instead of “Something went wrong”; check whether the same handling applies to QR wallet flows.

Written by the indexing model from the issue text.