fix: avoid NameError in time-frame error message (file_path -> file_name)

[Anai-Guo]

Problem

In investing_algorithm_framework/app/reporting/generate.py, get_time_frame_from_file_name(file_name) builds a helpful error message that references an undefined name file_path:

def get_time_frame_from_file_name(file_name: str) -> TimeFrame:
    ...
    try:
        return TimeFrame.from_string(time_frame_str)
    except ValueError:
        raise ValueError(
            f"Could not extract time frame from file name: {file_path}. "   # <- file_path is never defined
            ...
        )

The function parameter is file_name; file_path is not defined in this scope (nor imported anywhere), so the except ValueError handler itself raises NameError: name 'file_path' is not defined instead of the intended, informative ValueError.

Impact

TimeFrame.from_string() raises ValueError("Could not convert ... to TimeFrame") for any unrecognized time-frame token (investing_algorithm_framework/domain/models/time_frame.py). get_time_frame_from_file_name is called in a loop over data files in add_ohlcv_data_completeness_charts (generate.py:129). So whenever an OHLCV CSV's file name contains an unrecognized time-frame segment, the report generation crashes with a confusing NameError in the error path, masking the real diagnostic the code was trying to surface.

Fix

Reference the actual parameter name, file_name:

-            f"Could not extract time frame from file name: {file_path}. "
+            f"Could not extract time frame from file name: {file_name}. "

One-word change, no behavior change beyond the error message now rendering correctly.

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