fix: keep bulk tag actions linear, and say when they land

Select all on a 10k-row search, then Archive, froze the window with one
CPU pinned. gdb on the live process showed the UI thread cubic before the
write was ever sent: each optimistic row write emitted dataChanged, whose
handler refreshed the action labels by walking the whole selection, and
each step of that walk looked the message up with a linear scan of every
thread.

ThreadListModel now answers id lookups from a lazily rebuilt hash,
invalidated by its own structural signals and by hand at the two in-place
id changes. MainWindow::batchModelWrites() holds the label refresh while a
loop of optimistic writes runs, then refreshes once. Two list membership
tests became sets.

The announcement also used to fade on a timer whether or not the write
had landed. It now reads "applying" until a round trip through the
worker's queue says the write has run, then "done". An error takes the
label back from a late "done".

Item 211.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md b/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md
index 48c31af..a3df5be 100644
--- a/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md
+++ b/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md
@@ -148,6 +148,7 @@ taking that too literally.
 | 208 | No way to add a new correspondent to the contacts | workflow | ? | open, 2026-09-18, **asked for by the user** while settling 204: an "add to contacts" button on mail from someone not in the store. Writes a vcard, so it lands on 205's writer rather than 204's reader. **Needs a brainstorm when picked up** |
 | 209 | The calendar has no Week view | presentation | M | open, from 206's brainstorm. The occurrence list is the seam: a new painter over CalendarItem, no store change |
 | 210 | A repeating event cannot be edited "this and following" | workflow | S-M | open, from 206's brainstorm. Splits a series into two files, divides EXDATEs and overrides, shifts moved RECURRENCE-IDs, converts COUNT; see the spec's Out of scope |
+| 211 | Archiving thousands of selected rows freezes the window | defect | S | **done** 2026-10-31, unreleased. Cubic optimistic-update path made linear: a lazily rebuilt id index in `ThreadListModel` and `MainWindow::batchModelWrites()` refreshing the action labels once per loop. A write now reads "applying…" until the worker has run it, then "done". Hand-tested on a 10158-message archive |
 | 73 | This backlog is past four thousand lines | maintenance | S | **done** 2026-08-13; 5056 lines to 578, closed sections moved to `2026-08-03-post-0.1.0-usability-closed.md` |
 | 74 | "Searching..." keeps claiming a query is running while rows are already arriving | feedback | XS | **done** 2026-08-15, unreleased. The status-bar half only: the bar now counts threads per batch. The cold-cache delay itself was measured in 2026-08-11 and is not fixable here |
 | 75 | The tagging rules window forgets its size and its column widths | persistence | S | **done** 2026-08-13, shipped in 0.17.0. The window-kind question is left open, see the closed-items file |