- New src/date_view.rs: pure read-side functions (row_true_instant,
row_display_wall, row_display_day, filename_true_instant) applying the
per-source convention table for unconverted rows and the new-contract
triple for converted rows (ADR-0001).
- /memories: grouping on the row's true instant rendered in the owner's
display zone (prefs -> app default), not the client device offset.
SQL is a coarse interval pre-filter over the full years-back window;
exact month-day/week/month matching across past years happens in Rust
(memories::day_in_span, sqlite_w_week).
- Reels: ReelSelector::Memories carries an IANA display_tz instead of a
fixed minute offset; pre-gen params read REEL_PREGEN_DISPLAY_TZ; the
tz_offset_minutes ledger column stores the zone offset at render time.
- Insights: prompt-facing dates render as the display wall; the
proximity timestamp and chat context block use the true instant;
InsightGenerator reads the owner's display zone from prefs per call.
- GpsPhotoSummary carries the new-contract triple alongside the frozen
legacy date_taken.
Closes#119
