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Taylor HoandCarl 2dc5d4826d feat(composer): placement-aware pill resize guard for the activity strip

Replace the all-or-nothing hover freeze in the composer activity bar with
a guard that only pins pill widths when a resize would actually move the
open hover card.

- BotActivityBar.tsx: drop the blanket pinWidth/freezeLayout tied to bar
  hover; compute activeCardIndex (pill anchoring the open card) and pin
  width / freeze slot layout only for pills at or left of that index.
  The card renders side="top" align="start" — anchored to its pill's
  left edge — so only those pills can displace it by resizing
- Pills right of the anchor, and every pill when no card is open (even
  with the bar hovered), now resize freely with their label swaps and
  keep slot layout animation so neighbors ease instead of snapping
- Keep the membership/order freeze on bar hover unchanged — a pill
  exiting mid-hover would slide the strip under the cursor, which is
  independent of card placement
- Expose the membership hold via a data-hold attribute on the strip
  root, since the inline width pin is no longer a proxy for it
- channels.spec.ts: bar-hover test now waits on data-hold, asserts pills
  are NOT width-pinned during bar-only hover, and parks the cursor past
  the last pill (label swaps can legitimately grow a pill into the
  inter-pill gap); add "open card pins only its anchor pill and the
  pills left of it" covering both directions; add
  waitForSettledPillBoxes helper because pills mount with short generic
  labels and grow via the slot layout spring when seeded headlines land

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

2026-08-05 16:42:00 -07:00