bug: spotted lanternfly observation 385373720 missing from daily reports

# Context

- Problem: A user reports that iNaturalist observation https://www.inaturalist.org/observations/385373720 (spotted lanternfly, on the target species watchlist, Ontario) does not appear in the daily report for 2026-07-26 (its posted date) nor the following day. The observation's *observed* date is listed as roughly a year before its posted date.

# Repro & Outcome

- Current: Observation absent from the 2026-07-26 and 2026-07-27 daily reports.
- Expected: Observation appears in the report for the day it was posted.
- Steps: Fetch observations for `created_on=2026-07-26` with the watchlist taxon ids and the CA area, and check whether id 385373720 is returned.

# Investigation notes

- `src/observations.py:42-57` filters on `created_d1`/`created_d2`/`created_on`, i.e. the posted date, so an old *observed* date should not by itself exclude it — worth confirming against the live API.
- Other candidates to check: whether the spotted lanternfly taxon id is actually in the configured watchlist, whether the observation falls inside the CA bounding box in `src/settings.py:53`, and whether any downstream filter (quality grade, dedup, report rendering) drops it.