ui: the Source badge, and the source panels as slide-over pages

src/ui_app.hpp

@@ -109,11 +109,11 @@ struct TourView {
   void* done_user = nullptr;
 };
 
-/// One capability panel a source kind contributed to the side stack. `content` is the kind's own widget
+/// One capability panel a source kind contributed to the slide-over. `content` is the kind's own widget
 /// (made insensitive while the source is disconnected); the page wrapping it is named `name`.
 struct SourcePanelPage {
-  std::string name;   ///< stack page name: "source-" + the kind's panel id
-  std::string title;  ///< the pill's tooltip and accessible name; the page's own title stays empty
+  std::string name;   ///< slide-over page id: "source-" + the kind's panel id
+  std::string title;  ///< the slide-over page's title, and the segmented switch's label
   GtkWidget* content = nullptr;
 };
 
@@ -143,7 +143,7 @@ struct BadgeBar {
   GtkWidget* signals_slot = nullptr;  ///< left; empty in step 1, step 2 fills it
   GtkWidget* system_slot = nullptr;   ///< right: Trigger, Source
   Badge trigger;
-  Badge source;                       ///< task 3
+  Badge source;                       ///< opens the first source page; a read-out when the source has none
 };
 
 struct App {
@@ -1606,8 +1606,8 @@ void save_layout_now(App& app);
 void keep_tabs_icon_free(App& app);
 
 /// Capability panels (`src/ui_source.cpp`). `build_source_panels` adds the source kind's panels as
-/// pages of `side_stack`, once, before the first tick. `apply_source_panels` sets every panel's
-/// sensitivity from `connected` -- disabled, never hidden: the tab switcher owns visibility.
+/// pages of the slide-over (`source-<id>`), once, before the first tick. `apply_source_panels` sets every panel's
+/// sensitivity from `connected` -- disabled, never hidden.
 /// `sync_source_panels` is the per-tick call: it applies the model's own connection flag.
 void build_source_panels(App& app);
 void apply_source_panels(App& app, bool connected);
@@ -1925,7 +1925,7 @@ gboolean slideover_probe(gpointer user);  // UDPSCOPE_PROBE_SLIDEOVER_MS
 /// The badge bar (`src/ui_badges.cpp`): setup is reached by the object it configures.
 /// The Trigger badge's state word. Pure, so the probe can assert the whole table.
 const char* trigger_badge_state(bool enabled, bool armed, bool pending, bool has_event);
-void build_badge_bar(App& app);  // after build_slideover and after the toolbar (it reads trigger_toggle)
+void build_badge_bar(App& app);  // after build_slideover, the toolbar (it reads trigger_toggle) and build_source_panels (the Source badge's page)
 void sync_badge_bar(App& app);   // per tick and on every slide-over open/close; only writes what changed
 gboolean badges_probe(gpointer user);  // UDPSCOPE_PROBE_BADGES_MS
 gboolean source_kinds_probe_report(gpointer user);