Capture starts in the body, so forcing a title feels odd and body-only notes had no name — which made them unlinkable. Fix both: persist a display_title = explicit title if set, else the note's first non-empty body line (deterministic, no AI). The title field stays optional. - migration 0012: notes.display_title (NOT NULL, best-effort backfill; the app recomputes precisely on next save) - derive_display_title() helper, set on create + update - drive the /titles index, backlinks, graph edges + node labels, and [[wiki-link]] resolution off display_title so body-only notes are nameable, findable (command palette / [[ autocomplete), and linkable - rename-repoint generalized: inbound [[Old Name]] links now survive a name change via the first body line too, not just an explicit title - unit tests for the derivation (explicit wins, first non-empty line, blank/empty, length cap) - frontend: display_title on the Note type; title field placeholder now reads "Title (optional)" First item of M4.5 (frictionless input & recall); unblocks the linking work. Card rendering unchanged (no first-line duplication). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01FRgehjoz7Yv8LkUfADxACm