combine audiobooks: create audiobook in temp dir

add coloured skip message

audiobook_metadata/combine_audiobookmedia_to_m4b.py

@@ -46,13 +46,10 @@ def create_m4b(root_path: Path, book_dir: Path) -> None:
     if not media_files:
         return
 
-    output_file_tmp = root_path / "tmp" / f"{book_dir.name}.m4b"
-    if not output_file_tmp.parent.exists():
-        output_file_tmp.parent.mkdir()
     output_file_final = book_dir / f"{book_dir.name}.m4b"
 
     if output_file_final.exists():
-        log_message(f"[SKIP] {output_file_final}")
+        log_message(f"{RED}[SKIP]{RESET} {output_file_final}")
         log_message("Book already present")
         return
 
@@ -61,6 +58,7 @@ def create_m4b(root_path: Path, book_dir: Path) -> None:
     with (tempfile.TemporaryDirectory() as tmp):
         tmpdir = Path(tmp)
 
+        output_file_tmp = tmpdir / f"{book_dir.name}.m4b"
         concat_file = tmpdir / "concat.txt"
         metadata_file = tmpdir / "chapters.txt"