4d8fa3a0

By: Michael Lynch <git@mtlynch.io>

Fix autocomplete missing items added without a section

Previously rememberItemSection only wrote to item_sections when the
item had a non-empty section, so items added without a section were
never available as autocomplete suggestions. Now it always upserts,
storing an empty string for section when none is provided. GetSections
already filters WHERE section != '', so section autocomplete is
unaffected.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>