[mozzius]

Fixes APP-3352. Stacked on #11941.

What it does

• The pill stays until the top. Scrolling into the new posts no longer hides it. It hides when you:
  • reach or come to rest at the very top;
  • press it;
  • pull to refresh;
  • or once none of its posts are showing any more.
• Marking posts as read hasn't changed. Scrolling into the new posts still marks them read, so the next check adds newer posts above them rather than swapping them out from under you.
• It grows. While the pill is up, posts that later checks add above it join it, whether the check was timed, on focus or from a quick return. The count is the posts it covers that are still showing, one per post. The faces work as before.
• How it tracks posts. It knows each batch by the point it was fetched from, so a batch that's refetched and replaced isn't counted twice.
• Pressing it hides it straight away and scrolls to the top.
• Cheap when idle. With no offer up and nothing to take in, the pill doesn't scan the feed's rows, so other feeds don't pay for it on every render.

Known issues

• Posts loaded with "Show more posts" below the new posts aren't counted in the pill.
• After the pill has been hidden, it only comes back on a new restore or a significant return, never from a timed check. It goes up at most once for each staged page.

Test plan

• pnpm test src/features/followingV2 src/lib/appState (266 tests), pnpm typecheck, pnpm lint. New tests cover:
  • the pill staying up after the reader sees a new post;
  • growth from timed checks and quick returns;
  • hiding at the top and at rest at the top (through PostFeed's real wiring), and on a press, on a refresh and when nothing it offers is showing (unit tests);
  • a dismissed pill not coming back without a new offer.
• Device: with the pill up after a warm open, scroll into the new posts. The pill should stay. Wait for a timed check: the count should grow. Scroll to the top: the pill should hide.

🤖 Generated with Claude Code

[linear-code]

APP-3352

[github-actions]

Size	Old size	New size	Diff
Uncompressed	9.76 MB	9.76 MB	+1.09 KB (0.01%)
Gzip	2.86 MB	2.86 MB	+455 B (0.02%)

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[github-actions]

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