- Markdown exporter: export to directory creates one .md file per conversation
  - Filename format: YYYY-MM-DD-title-shortid.md
  - Detects directory mode by path (existing dir, trailing /, or no extension)
- HTML exporter: fix media gallery conversation links not navigating
  - Was passing ID string instead of conversation object to showConversation()
- Bump version to 2.4.1

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>