Fix Unread/startup crash; add reader-mode toggle and swipe navigation

- Root cause of the reported crashes: observeUnread/observeByFeed/
  observeSaved used SELECT *, pulling feedContentHtml/extractedContent
  (potentially large per-article blobs) just to render a list row.
  With 107 feeds worth of real articles this blows past Android's
  CursorWindow/memory limits, scaling with item count -- and since
  Unread is now the landing screen, it crashed at startup too. Added
  an ArticleListItem projection excluding the heavy content columns;
  list queries now only select what a row actually renders.
- FilterRuleEngine now takes a small Titled interface (title/feedId)
  instead of the full entity, so it works with both ArticleEntity and
  the new lighter projection.
- Reader-mode toggle: a button in the reader to manually switch
  between feed-provided content and Readability-extracted full text,
  matching Inoreader's full-text-view toggle (previously only an
  automatic fallback when feed content was thin).
- Swipe between articles: ReaderScreen now wraps a HorizontalPager over
  a snapshot of the current list's article-id order, so swiping moves
  to the next/previous article. Snapshotted rather than live, since
  marking an article read would otherwise drop it from the live Unread
  query mid-swipe and shift every later page underneath the user.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EZ7ikw2ukGJFTHE3bJS7zL

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