Build and Test State-Driven Screen

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Problem

Implement a small state-driven screen model for a native mobile project. Given a data source that fetches a list of items and a screen controller/view-model that exposes UI state, write a functionally complete implementation that supports idle, loading, success, and error states. The screen should also support retrying after a failed load. Return the final state object after each action so it can be rendered by the native UI layer.

Constraints

1 <= len(actions) <= 10^4
Each action is either "load" or "retry"
Each response is either the string "error" or a list of 0 to 10^3 strings
Total number of returned item strings across all successful responses is at most 10^5

Function Signature

def process_screen_actions(actions, responses):

Your solutionPython 3

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