fix: close progress bars on exception in io.py

[kredd2506]

Description

Wrap tqdm progress bar usage in try/finally blocks in two functions in langextract/io.py so that progress_bar.close() is always called, even when an exception is raised mid-iteration.

Location 1 — save_annotated_documents: If the annotated_documents generator raises (e.g. an InferenceOutputError from a failed LLM call), the original code left the progress bar open since progress_bar.close() sat unconditionally after the with open(...) block.

Location 2 — download_text_from_url: If response.iter_content() raises a requests.RequestException (e.g. a connection reset mid-download), the except block re-raised without calling progress_bar.close().

Fixes #401

Bug fix

How Has This Been Tested?

Ran the existing test suite (excluding the pre-existing openai import failure unrelated to this change):

$ python -m pytest tests/ -q --ignore=tests/inference_test.py
364 passed, 76 warnings, 29 subtests passed

Also manually verified with a generator that raises mid-stream — confirmed progress_bar.close() is called in both the exception and success paths.

Checklist:

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• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach.
• I have made any needed documentation changes, or noted in the linked issue(s) that documentation elsewhere needs updating.
• I have added tests, or I have ensured existing tests cover the changes
• I have followed Google's Python Style Guide and ran pylint over the affected code.

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