fix: change_cat accepts multiple comma-separated nzo_ids

[thedancingdeveloper]

Summary

Fixes #76: real SABnzbd's _api_change_cat accepts a comma-separated list of nzo_ids in value, applying the category change to all of them:

# sabnzbd/api.py:406-416
def _api_change_cat(name, kwargs):
    """API: accepts value(=nzo_id), value2(=category)"""
    nzo_ids = clean_comma_separated_list(kwargs.get("value"))
    cat = kwargs.get("value2")
    if nzo_ids and cat:
        if is_none(cat):
            cat = None
        result = sabnzbd.NzbQueue.change_cat(nzo_ids, cat)
        return report(keyword="status", data=bool(result > 0))

RustNZB's handle_change_cat treated value as a single job ID, so a comma-separated multi-ID value (e.g. bulk re-categorize in a queue UI) matched no job and the category change silently failed for all of them.

Fix

handle_change_cat now splits value on , and applies the category to every matching job, returning {"status": true} if at least one changed — matching real SABnzbd's bool(result > 0) semantics.

Test plan

• cargo test -p nzb-web — added change_cat_applies_to_multiple_comma_separated_ids.
• cargo clippy -p nzb-web --all-targets — clean.
• Full nzb-web test suite passes.

🤖 Generated with Claude Code

[thedancingdeveloper]

Superseded — this change landed via #84, which stacked all of #71-#77's fixes together and was squash-merged to save on redundant CI runs. Closing without merging to avoid re-applying the same diff.