Comments in tree structure are included in filenames

## Description
When creating files from a tree structure that includes comments (like `main.py # FastAPI application`), the comment becomes part of the filename. This results in files being created with names like `main.py # FastAPI application` instead of just `main.py`.

#### Example input:
```
app/
├── main.py # FastAPI application instance
└── config.py # Configuration settings
```

#### Current output:
- Creates: `main.py # FastAPI application instance`
- Should create: `main.py`

No source file or test is named. Start by locating the code that parses tree lines and creates filenames, then reproduce the example with inline comments; done means comment text and surrounding spacing are excluded while directory and file names remain correct.

Written by the indexing model from the issue text.