Add searchRank/bestSearchRank utilities that compute a tier (0=exact,
1=prefix, 2=fuzzy-only). Both useNoteSearch and WikilinkChatInput now
sort by rank tier first, then by fuzzy score, ensuring notes with exact
title or alias matches always surface above partial/fuzzy matches.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>