cabin.rs

- delete use e
- pub struct Etage line 28 is unused
- impl door -> is_open line 34 -> only used once and Fahrkabine doesnt use this approach (inconsistence)
- get_state is unused? line 52
- press_level_button -> warning?

Start by reading cabin.rs, especially the referenced lines 28, 34, and 52, and run the Rust build or tests to inspect warnings. Check each listed unused item and compare the door handling with Fahrkabine; done means the identified warnings and inconsistencies are resolved without changing the simulation behavior.

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