ghreprimand 28c43121d7 Fix session export 500 on multimodal/None message content (#1984) ...

txt/html/md export joined and string-munged message.content directly, so a
multimodal turn (content is a list of blocks) crashed export with a TypeError
on join (txt) / AttributeError on .replace (html), and None content (tool-only
assistant turns) rendered as the literal 'None'. Add a _content_to_text helper
that flattens string/list/None to plain text and apply it at the three export
sites. JSON export is unchanged (it serializes structured content correctly).
Plain-string content is returned unchanged, so existing exports are identical.

Co-authored-by: ghreprimand <203024559+ghreprimand@users.noreply.github.com>

2026-06-04 12:53:44 +01:00

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