Keep open tool cards out of groups

PLAN.md

@@ -1129,17 +1129,17 @@ dev-updater (Kotlin 2.4.x, CMP 1.11.x, JDK 21).
 4. **Session screen** — the core:
    - The transcript rendered from the event stream: markdown, inline images,
      tool cards, question cards.
-   - **A run of adjacent tool calls is one collapsed card, except for the
-     call still running and the last call in the transcript** (2026-09-15).
-     What the session is doing right now, or did last, is the one thing worth
-     seeing without opening anything, and a heading counting it hides it. What
-     folds a call back into its run is not finishing but being *overtaken*:
-     anything arriving behind it, a reply included, makes it history, and a
-     session that has run its last command and is composing its answer leaves
-     that command standing until the answer starts. Grouping is a display
-     decision (`groupToolRuns`) and a cut run's pieces are keyed there — the
-     first piece keeps the run's name, since that name is what survives a page
-     of history landing in front of it.
+   - **A run of adjacent tool calls is one collapsed card, except for a call
+     that is still running, open, or last in the transcript** (2026-09-15).
+     What the session is doing right now, did last, or what the reader is
+     looking at is the one thing worth seeing without a heading hiding it.
+     What folds a finished call back into its run is being *overtaken* while
+     closed: anything arriving behind it, a reply included, makes it history,
+     and a session that has run its last command and is composing its answer
+     leaves that command standing until the answer starts. Grouping is a
+     display decision (`groupToolRuns`) and a cut run's pieces are keyed there
+     — the first piece keeps the run's name, since that name is what survives
+     a page of history landing in front of it.
    - **Anything that is a note *about* the conversation rather than a turn in
      it is closed by default** — a tool call, a peer message, a memory note.
      Open-ness is the screen's, never the card's: a card that remembered for