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Taylor HoandCarl 3e597d003b feat(composer): ship live activity by default and scroll the pill strip when narrow

Remove the composerLiveActivity preview flag so the live-activity hover
preview ships for everyone, and land the pill strip overflow behavior
for narrow containers.

Flag removal (ships by default):
- preview-features.json: drop the composerLiveActivity entry — absence
  from the manifest means stable/always-on; E2E preview seeding and the
  Settings > Experiments card both derive from the manifest, so they
  pick this up automatically
- BotActivityBar.tsx: remove the useFeatureEnabled gate and the legacy
  flag-off "View activity" popover item; the pill hover popover now
  always renders ComposerLiveActivityFeed
- Remove the now-dead openAgentSessionPubkey plumbing through
  BotActivityAgentPill / BotActivityComposerAction /
  ChannelComposerActivityRow / ChannelPane — it only backed the legacy
  item's active-session highlight
- Update stale flag references in ComposerLiveActivityFeed's doc
  comment, the agents debug harness README, and a channels.spec.ts
  comment

Pill strip overflow (BotActivityBar.tsx, ChannelComposerActivityRow.tsx):
- With several pills in a narrow container (thread panel toolbars
  especially), pills keep their natural label-truncated width and the
  strip scrolls horizontally — scrollbar hidden, edge gradient fades
  signalling clipped pills — instead of compressing every pill into an
  unreadable sliver
- New useStripOverflowFades hook tracks scroll position plus
  scroller/content resizes (ResizeObserver) so fades appear and
  disappear without a re-render triggering event
- A lone pill shrinks to fit (min-w-0) instead of scrolling — an edge
  fade over a single pill reads as a cut-off bug, not an affordance
- layoutScroll on the scroller keeps motion's slot layout animations
  measured relative to the scroll offset
- e2e: add "narrow strip scrolls horizontally with edge fades instead
  of compressing pills" and "lone pill shrinks to fit a narrow
  container without scroll fades"

Verified: tsc, biome check, desktop unit tests (3651 pass), and the
pill/strip/live-activity e2e subset. Two pre-existing channels.spec.ts
failures ("composer does not shift when the activity row mounts and
clears", "hovering the bar itself freezes pill order without opening a
card") reproduce identically on the parent commit with a clean tree —
unrelated to this change.

Co-authored-by: Taylor Ho <taylorkmho@gmail.com>
Signed-off-by: Taylor Ho <taylorkmho@gmail.com>

2026-08-05 16:41:57 -07:00