refactor(burgs): centralize burg management logic in Burgs module

Moved burg-related functions like `removeBurg`, `changeGroup`, and `toggleCapital` into the Burgs module to improve code organization and maintainability. Updated all references to these functions across the codebase. This change reduces duplication and ensures consistent behavior for burg management operations.

modules/burgs-generator.js

@@ -314,11 +314,18 @@ window.Burgs = (() => {
 
   function defineGroup(burg, populations) {
     if (burg.lock) {
-      // locked bugrgs: don't change group if it still exists
+      // locked burgs: don't change group if it still exists
       const group = options.burgs.groups.find(g => g.name === burg.group);
       if (group) return;
     }
 
+    const defaultGroup = options.burgs.groups.find(g => g.isDefault);
+    if (!defaultGroup) {
+      ERROR & console.error("No default group defined");
+      return;
+    }
+    burg.group = defaultGroup.name;
+
     for (const group of options.burgs.groups) {
       if (!group.active) continue;
 
@@ -348,8 +355,7 @@ window.Burgs = (() => {
         if (!isFit) continue;
       }
 
-      // apply fitting or default group
-      burg.group = group.name;
+      burg.group = group.name; // apply fitting group
       return;
     }
   }
@@ -404,7 +410,7 @@ window.Burgs = (() => {
     const temple = +burg.temple;
     const shantytown = +burg.shanty;
 
-    const style = "bw";
+    const style = "natural";
 
     const url = new URL("https://watabou.github.io/city-generator/");
     url.search = new URLSearchParams({
@@ -476,7 +482,7 @@ window.Burgs = (() => {
     const style = (() => {
       if ([1, 2].includes(biome)) return "sand";
       if (temp <= 5 || [9, 10, 11].includes(biome)) return "snow";
-      return "minimal";
+      return "default";
     })();
 
     const url = new URL("https://watabou.github.io/village-generator/");
@@ -556,5 +562,38 @@ window.Burgs = (() => {
     return burgId;
   }
 
-  return {generate, getDefaultGroups, specify, defineGroup, getPreview, getType, add};
+  function changeGroup(burg, group) {
+    if (group) {
+      burg.group = group;
+    } else {
+      const validBurgs = pack.burgs.filter(b => b.i && !b.removed);
+      const populations = validBurgs.map(b => b.population).sort((a, b) => a - b);
+      defineGroup(burg, populations);
+    }
+
+    drawBurgIcon(burg);
+    drawBurgLabel(burg);
+  }
+
+  function remove(burgId) {
+    const burg = pack.burgs[burgId];
+    if (!burg) return tip(`Burg ${burgId} not found`, false, "error");
+
+    pack.cells.burg[burg.cell] = 0;
+    burg.removed = true;
+
+    const noteId = notes.findIndex(note => note.id === `burg${burgId}`);
+    if (noteId !== -1) notes.splice(noteId, 1);
+
+    if (burg.coa) {
+      byId("burgCOA" + burgId)?.remove();
+      emblems.select(`#burgEmblems > use[data-i='${burgId}']`).remove();
+      delete burg.coa;
+    }
+
+    removeBurgIcon(burg.i);
+    removeBurgLabel(burg.i);
+  }
+
+  return {generate, getDefaultGroups, specify, defineGroup, getPreview, getType, add, changeGroup, remove};
 })();