Update log in Methodology + footer chip with the last data update

[lszoszk]

Adds a visible record of what was added to the database, and what was checked and left out, starting today.

• Footer chip: "Data updated 13 Oct 2026 · +8 new". The date is the later of the API build date and the newest log entry; the count is documents added in the last 30 days. Clicking it opens About and scrolls to the log.
• About › Methodology › Update log: a scrollable list, newest first.
  • Each document added since 13 October 2026: date, symbol (opens the reader), title and body.
  • Each document reviewed and not added, with the reason. Today that is A/80/115, a Secretariat note pointing to reports already in the database.
• Data: docs/updates/log.json, written by build_feeds.py in the pipeline after every corpus change. Additions come from firstAddedAt; rejections come from the hand-kept mysite_pythonanywhere/not_added.json.

Tested

• Local preview: the chip renders, clicking it opens the log, the symbol link opens #documents/cerd-c-gc-40, and the not-added row shows its reason.
• Full chromium suite: 136 passed, 1 skipped.

🤖 Generated with Claude Code