Replace recipe/schematic dropdowns with button and selection dialog

src/ui/RecipeSelectionDialog.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <optional>
+#include <string>
+#include <vector>
+
+#include <QDialog>
+#include <QString>
+
+struct Building;
+struct GameConfig;
+class Simulation;
+class QPushButton;
+
+// One selectable entry in the recipe/schematic selection dialog
+// (REQ-UI-SELECT-BUTTON). The "(None)" entry uses an empty id.
+struct RecipeSelectionOption
+{
+    std::string id;
+    QString     caption;
+    QString     tooltip;
+};
+
+// Builds the lock-aware list of selectable options for a production building,
+// with display captions and info tooltips (REQ-UI-SELECT-BUTTON,
+// REQ-UI-SELECT-TOOLTIP). The first entry is always a "(None)" option with an
+// empty id. Shared by the selection dialog and the panel selection button so
+// both render identical captions and tooltips.
+std::vector<RecipeSelectionOption> buildRecipeSelectionOptions(
+    const Building& building, Simulation& sim, const GameConfig& config);
+
+// Modal dialog showing a grid of option buttons (REQ-UI-SELECT-BUTTON). The
+// game is paused by the caller while it is open. Clicking an option selects it
+// and closes the dialog; dismissing it (close/Esc) leaves no choice.
+class RecipeSelectionDialog : public QDialog
+{
+    Q_OBJECT
+
+public:
+    RecipeSelectionDialog(const std::vector<RecipeSelectionOption>& options,
+                          const QString& title, QWidget* parent = nullptr);
+
+    std::optional<std::string> getChosenId() const;
+
+private:
+    void onOptionClicked(int index);
+
+    std::vector<std::string>   m_optionIds;
+    std::optional<std::string> m_chosenId;
+};