Fix rural population calculation to only count small burgs

Rural population now correctly counted only from burgs with ≤100 people.
Eliminates double-counting and ensures consistent statistics across
charts and CSV exports.

modules/burgs-and-states.js

@@ -1026,13 +1026,17 @@ window.BurgsAndStates = (() => {
       states[s].cells += 1;
       states[s].area += cells.area[i];
       if (cells.burg[i]) {
-        // Burg represents ALL population for this cell (stored in thousands)
+        const burgPopulation = pack.burgs[cells.burg[i]].population;
-        states[s].urban += pack.burgs[cells.burg[i]].population;
+        if (burgPopulation > 0.1) {
+          // Large burg (>100 people) = urban population
+          states[s].urban += burgPopulation;
+        } else {
+          // Small burg (≤100 people) = rural population
+          states[s].rural += burgPopulation;
+        }
         states[s].burgs++;
-      } else {
-        // Only count cells.pop for unsettled areas (no burg present)
-        states[s].rural += cells.pop[i];
       }
+      // Cells without burgs have no population (rural population is housed in small burgs)
     }
 
     // convert neighbors Set object into array

modules/dynamic/overview/charts-overview.js

@@ -672,7 +672,14 @@ function getUrbanPopulation(cellId) {
 }
 
 function getRuralPopulation(cellId) {
-  return pack.cells.pop[cellId] * populationRate;
+  const burgId = pack.cells.burg[cellId];
+  if (!burgId) return 0; // No burg = no rural population
+  
+  const burgPopulation = pack.burgs[burgId].population;
+  if (burgPopulation > 0.1) return 0; // Burg has >100 people = no rural population
+  
+  // Small burg (≤100 people) = count the burg's actual population as rural
+  return burgPopulation * 1000 * populationRate;
 }
 
 function sortData(data, sorting) {