Function import_csv 

pub fn import_csv(
    model: &mut GalaxyModel,
    path: &Path,
    _source_name: &str,
) -> Result<ImportStats, ImportError>

Import community coordinate data from a CSV file into the galaxy model.

Expected CSV columns (flexible naming via aliases):

• System Name (required)
• Portal Glyphs (required) – 12 hex digits
• Galaxy (optional, defaults to “Euclid”)
• Biome (optional)
• Platform (optional, currently ignored)

Returns ImportStats summarizing what was imported.