show production progress

src/ui/SelectedBuildingPanel.cpp

@@ -1,5 +1,6 @@
 #include "SelectedBuildingPanel.h"
 
+#include <algorithm>
 #include <cctype>
 #include <map>
 #include <string>
@@ -264,6 +265,30 @@ void SelectedBuildingPanel::refreshBuffers(const Building* b)
         }
     }
 
+    if (isProductionBuilding(b->type) && (recipe || shipDef))
+    {
+        const double durationSeconds = recipe
+            ? recipe->durationSeconds
+            : shipDef->blueprint.productionTimeSeconds;
+
+        bufText += QString("Cycle: %1 s\n").arg(durationSeconds, 0, 'f', 1);
+
+        if (b->production.has_value())
+        {
+            const Tick cycleTicks  = secondsToTicks(durationSeconds);
+            const Tick completesAt = b->production->completesAt;
+            const Tick currentTick = m_sim->currentTick();
+            const Tick elapsed     = currentTick - (completesAt - cycleTicks);
+            const int  pct         = static_cast<int>(
+                std::max(Tick(0), std::min(cycleTicks, elapsed)) * 100 / cycleTicks);
+            bufText += QString("Progress: %1%\n").arg(pct);
+        }
+        else
+        {
+            bufText += "Progress: idle\n";
+        }
+    }
+
     m_buffersLabel->setText(bufText);
 }