explain an item wherever the UI names one

Every display naming an item now shows that item's production tooltip, not
only the selection panel's chips: the header block stock, the total cost of
a building multi-selection, the remaining scrap of a debris selection, the
icons of every recipe summary, and a blueprint card's cost.

ItemTooltip moves out of the selection panel and takes an
ItemTooltipContext of its own -- an item is named all over the UI, and the
panel's context carries visuals and a debug flag no tooltip reads. A
recipe line wraps each icon with its amount so the pair can be pointed at
as one statement, and attaches tooltips only where asked: a module button
and the item tooltip itself draw the same line and stay silent.

Hover only wherever the display sits on something the player clicks, whose
click is not free to explain. Note that a recipe line on an option button
can no longer be transparent to the mouse -- Qt never looks inside a
transparent widget for the cursor -- so it relies on press propagation to
keep picking the option.

The header block stock loses world.building_blocks_tooltip, showing what
every other block icon shows instead. The Expand button keeps no tooltip:
its cost is painted into its face with nowhere to hang one, and the button
is due to be removed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ne3mejABZoLWKLh8fgpM3x

src/ui/RecipeSelectionDialog.h

@@ -7,12 +7,11 @@
 #include <QString>
 
 #include "BuildingType.h"
+#include "ItemTooltipContext.h"
 #include "ModalDialog.h"
 #include "RecipeLineRow.h"
 
 struct GameConfig;
-class BuildingIconCache;
-class ItemIconCache;
 class Simulation;
 class QPushButton;
 
@@ -47,10 +46,12 @@ class RecipeSelectionDialog : public ModalDialog
     Q_OBJECT
 
 public:
-    // The icon caches draw each option's recipe line (REQ-UI-ITEM-ICON). Not owned.
+    // The context's icon caches draw each option's recipe line (REQ-UI-ITEM-ICON), and
+    // the rest of it lets those items explain themselves (REQ-UI-ITEM-VALUE-TOOLTIP).
+    // Nothing in it is owned.
     RecipeSelectionDialog(const std::vector<RecipeSelectionOption>& options,
-                          const QString& title, ItemIconCache* itemIcons,
-                          BuildingIconCache* buildingIcons, QWidget* parent = nullptr);
+                          const QString& title, const ItemTooltipContext& context,
+                          QWidget* parent = nullptr);
 
     std::optional<std::string> getChosenId() const;