feat: resource consumption rate display in village panel

Village panel now shows daily consumption rates alongside stockpiles (e.g. Food: 15 (-2/d), Wood: 7 (-1/d)). Rates are computed over a rolling 200-tick (~1 day) window by summing item_consumed economic events. The rate display only appears when non-zero, keeping the panel clean until actual consumption occurs. Closes the feedback loop: events show individual transfers, rates show aggregate trends.

world/ui/ui.gd

@@ -68,12 +68,19 @@ func _on_village_changed(village: SimVillage) -> void:
 	var speed_text := ""
 	if simulation_manager.has_method("get_current_speed"):
 		speed_text = simulation_manager.get_current_speed()
+	var rates: Dictionary = simulation_manager.get_resource_rates()
+	var food_rate := ""
+	if rates["food_per_day"] > 0.01:
+		food_rate = "  (−%.0f/d)" % rates["food_per_day"]
+	var wood_rate := ""
+	if rates["wood_per_day"] > 0.01:
+		wood_rate = "  (−%.0f/d)" % rates["wood_per_day"]
 	village_stats_label.text = (
 		"""
 	Village   [%s]
 
-	Food: %s
-	Wood: %s
+	Food: %s%s
+	Wood: %s%s
 	Safety: %s
 	Knowledge: %s
 	Starving: %s
@@ -86,7 +93,9 @@ func _on_village_changed(village: SimVillage) -> void:
 		% [
 			speed_text,
 			round(village.food),
+			food_rate,
 			round(village.wood),
+			wood_rate,
 			round(village.safety),
 			round(village.knowledge),
 			simulation_manager.get_starving_count(),