Fix extraction regression on kottke; add Older view, mark-read-from-here

- ReaderExtractor: the un-hide-before-extracting fix (for soft paywalls
  like West Hawaii Today) was unconditional -- it also un-hid normal,
  legitimately-collapsed chrome (kottke's footer/membership notice), which
  Readability then folded into the result alongside the real article.
  Reported live with a screenshot showing the extracted content wrapped in
  site footer boilerplate. Now tries the normal (hidden-respecting) pass
  first and only falls back to the un-hide pass if that came back thin
  (<500 chars), keeping whichever pass actually found more text. Verified
  live: the same kottke article now stays clean and stable (no delayed
  switch to the footer version).

- New Unread/Older split: the default Unread view is now clamped to the
  last 72 hours (RECENT_WINDOW_MS); the rest of the unread backlog moved
  to a new "Older" view (new FeedListScreen row, ArticleDao.observeUnread
  now takes a cutoff, observeOlderUnread/observeUnreadCount/
  observeOlderUnreadCount added). Undated articles are kept in the main
  Unread view rather than silently dropped from both. Verified live: 150
  recent / 1172 older, summing to the prior combined total.

- "Mark read from here": long-press an article row to mark it and
  everything older in that same filtered list as read in one batch
  (re-added ArticleDao.markReadBatch, this time as an explicit,
  confirmed action -- not the implicit on-scroll version that was
  reverted earlier). Verified live: confirmed a 147-article batch: the
  tapped article and older were marked read, newer ones above it were not.

- BACKLOG.md: added a YouTube-embeds note (JS is off in the reader
  WebView, so embeds currently show broken -- rough shape is a tap-to-play
  thumbnail rather than turning JS on for third-party content).

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