Drop swipe-to-next-article; bottom Previous/Next bar; smaller titles; bug report

- Dropped swipe-to-next-article entirely, per explicit instruction. Two
  different fixes for the gesture interfering with WebView scrolling had
  already been tried and didn't resolve the reported jerkiness (one even
  broke swipe outright and was reverted) -- rather than keep tuning gesture
  detection, removed the gesture altogether.
- ReaderScreen: new bottom bar with explicit Previous/Next buttons
  (disabled at the ends of the article queue), replacing swipe. This is
  the first slice of the "bottom action strip" backlog item. Verified
  live: Previous/Next correctly page through the article queue with the
  right enabled/disabled state at each end.
- Smaller title text: reader top bar title (titleMedium, was TopAppBar's
  default titleLarge) and article list row titles (bodyMedium, was
  ListItem's default bodyLarge).
- New "Report bug" action in the reader's overflow menu: a dialog for a
  short description, which gets bundled with the article's title/URL/id,
  feed id, reader-mode state, and save/Stash state into one text block
  copied to the clipboard on confirm (verified live, including the
  "Copied to clipboard" confirmation) -- enough to reproduce an issue in
  the tungsten emulator without needing live device access.
- BACKLOG.md: marked the done slice of the bottom-strip item, added a
  note on the scroll-jerkiness investigation so far (two ruled-out
  theories) since swipe removal may or may not affect it -- worth a fresh
  look now that nothing intercepts touches above the WebView at all.

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