ui: the readouts show in a strip under the plot when the dock is hidden

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

src/ui_app.hpp

@@ -610,6 +610,17 @@ struct App {
   GtkWidget* dock_measures_edit = nullptr;
   /// One value label per measurement, in `measures` order (the dock's copy of `measure_labels`).
   std::vector<GtkWidget*> dock_measure_labels;
+  /// The readouts strip under the plot (`main-window.ui` `readouts_strip`, `src/ui_dock.cpp`): shown only
+  /// while the dock is not. Its value labels mirror the dock's one for one -- `strip_cursor_deltas` the
+  /// `d` cell of each `dock_cursor_lines` entry, `strip_measure_labels` each of `dock_measure_labels` --
+  /// and `strip_cursor_who` the cursor lines' `who` cells, all written from the dock setters' arguments.
+  GtkWidget* readouts_strip = nullptr;
+  GtkWidget* strip_box = nullptr;
+  GtkWidget* strip_cursor_box = nullptr;   ///< the cursor chips; insensitive with the cursors off
+  GtkWidget* strip_measure_box = nullptr;  ///< the measurement chips
+  std::vector<GtkWidget*> strip_cursor_who;
+  std::vector<GtkWidget*> strip_cursor_deltas;
+  std::vector<GtkWidget*> strip_measure_labels;
   /// The measurements the user set up, and what they last computed. The list is the state;
   /// the results are recomputed on a throttle (the numbers are window statistics, and the
   /// window scrolls every frame -- 60 recomputations a second of every sample is not a
@@ -1784,6 +1795,13 @@ void dock_rebuild_measures(App& app);
 void dock_cursor_cell(App& app, std::size_t line, const std::string& a, const std::string& b,
                       const std::string& d);
 void dock_measure_value(App& app, std::size_t i, const std::string& text);
+/// The readouts strip under the plot (`src/ui_dock.cpp`): the third reader of the same strings. It is
+/// filled by the `dock_*` rebuilds and written by the `dock_*` setters above (so nothing here formats),
+/// and shown exactly when the dock is not: `sync_readouts_strip()` is called by the tick after the
+/// show-sidebar reconciliation. `dock_set_cursors_sensitive()` is the one writer of the cursor readouts'
+/// sensitivity, for the dock's grid and the strip's chips together.
+void sync_readouts_strip(App& app);
+void dock_set_cursors_sensitive(App& app, bool on);
 /// The Events block under the readouts (`src/ui_dock.cpp`): compact rows (marker, title, time; no
 /// thumbnails) from `event_store->list()`, newest first, and a Manage button for the `events` page.
 /// `dock_rebuild_events()` follows every change of what is *cached*, `dock_mark_events()` every change