docs: the readouts strip follows the collapsed state

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/claude/architecture.md

@@ -135,12 +135,14 @@ touching the data path.
   (`open_measure_dialog()`), not part of the `measure` page.
 
   **The readouts strip** (`readouts_strip` in `main-window.ui`, between `plot_overlay` and `badge_bar` in
-  `left_column`; filled by `ui_dock.cpp`) carries the same readouts when the dock is not on screen: a flat
+  `left_column`; filled by `ui_dock.cpp`) carries the same readouts when the dock is not beside the plot: a flat
   **Cursors** button and one chip (`who` + delta) per cursor line, then a **Measures** button and one chip per
-  measurement. `sync_readouts_strip()` shows it exactly when `adw_overlay_split_view_get_show_sidebar()` is
-  false; the tick calls it right after re-asserting `sidebar_wanted` and *before* `set_collapsed()` (so the
-  split view's own collapse-time `show-sidebar` write is never read, and the strip does not flash on a
-  narrowing). Its labels (`strip_cursor_who`, `strip_cursor_deltas`, `strip_measure_labels`) are rebuilt by
+  measurement. `sync_readouts_strip()` shows it exactly when `!adw_overlay_split_view_get_show_sidebar() ||
+  adw_overlay_split_view_get_collapsed()` -- the Dock button put the dock away, or the window is collapsed and
+  the dock is an overlay on the plot (the strip stays on screen even while that overlay is open). The tick
+  calls it right after re-asserting `sidebar_wanted` and *before* `set_collapsed()` (so the split view's own
+  collapse-time `show-sidebar` write is never read); that means the `collapsed` it reads is the previous
+  frame's, and the strip follows a collapse or a widening one tick late, never through a wrong state. Its labels (`strip_cursor_who`, `strip_cursor_deltas`, `strip_measure_labels`) are rebuilt by
   `dock_rebuild_cursors()` / `dock_rebuild_measures()` and written by `dock_cursor_cell()` /
   `dock_measure_value()` from the same argument as the dock's, so there is no second formatter;
   `dock_set_cursors_sensitive()` is the one writer of the cursor readouts' sensitivity (the dock's grid and