Refactor map item loading logic into a dedicated function

src/main.js

@@ -358,6 +358,17 @@ async function pathToObjectUrl(path) {
   return convertFileSrc(path);
 }
 
+function applyPromptFromMap(item) {
+  promptInput.value = typeof item?.prompt === 'string' ? item.prompt : '';
+}
+
+function loadMapItem(item, fileUrl, statusPrefix = 'Loaded') {
+  currentMapPath = item.path;
+  applyPromptFromMap(item);
+  setSkyFromUrl(fileUrl);
+  setStatus(`${statusPrefix} ${item.filename}`);
+}
+
 function resetProgressState() {
   progressState = {
     upscale: null,
@@ -468,23 +479,17 @@ async function refreshThumbnails(selectedPath, shouldLoadSelection = true) {
     el.title = item.filename;
     el.addEventListener('click', () => {
       if (fileUrl) {
-        currentMapPath = item.path;
-        setSkyFromUrl(fileUrl);
-        setStatus(`Loaded ${item.filename}`);
+        loadMapItem(item, fileUrl);
       }
     });
     thumbList.appendChild(el);
 
     if (fileUrl) {
       if (shouldLoadSelection && idx === 0 && !selectedPath) {
-        currentMapPath = item.path;
-        setSkyFromUrl(fileUrl);
-        setStatus(`Showing ${item.filename}`);
+        loadMapItem(item, fileUrl, 'Showing');
       }
       if (shouldLoadSelection && selectedPath && selectedPath === item.path) {
-        currentMapPath = item.path;
-        setSkyFromUrl(fileUrl);
-        setStatus(`Showing ${item.filename}`);
+        loadMapItem(item, fileUrl, 'Showing');
       }
     }
   }