Missing file Mixpanel.framework and Branch.framework

### What is this about?

This Copy Files build phase contains a reference to a missing file 'Mixpanel.framework'. (in target 'MetaMask' from project 'MetaMask')
This Copy Files build phase contains a reference to a missing file 'Branch.framework'. (in target 'MetaMask' from project 'MetaMask')

### Scenario

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### Design

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### Technical Details

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### Threat Modeling Framework

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### Acceptance Criteria

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### References

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Start by inspecting the MetaMask iOS project and its Copy Files build phase, where the missing Mixpanel.framework and Branch.framework references are reported. Determine whether these references should be removed or restored, then verify that the MetaMask target builds without missing-file warnings.

Written by the indexing model from the issue text.