fix: Fail fast if output directory is invalid or not writable #325
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I noticed that the tool doesn't verify if the output directory exists or is writable before starting the concatenation process.
If you're processing a large batch of files, it's pretty frustrating to wait for the whole thing to run only to fail at the very last second because of a typo in the output path or a permission issue.
I added a quick check in
validate_output_pathto fail fast if the destination folder isn't there or isn't writable. Seems like a safer default.📚 Documentation preview 📚: https://stitchee--325.org.readthedocs.build/en/325/