feat: implement upload-based folder indexing and synchronization features

surfsense_desktop/src/modules/folder-watcher.ts

@@ -188,6 +188,31 @@ function walkFolderMtimes(config: WatchedFolderConfig): MtimeMap {
   return result;
 }
 
+export interface FolderFileEntry {
+  relativePath: string;
+  fullPath: string;
+  size: number;
+  mtimeMs: number;
+}
+
+export function listFolderFiles(config: WatchedFolderConfig): FolderFileEntry[] {
+  const root = config.path;
+  const mtimeMap = walkFolderMtimes(config);
+  const entries: FolderFileEntry[] = [];
+
+  for (const [relativePath, mtimeMs] of Object.entries(mtimeMap)) {
+    const fullPath = path.join(root, relativePath);
+    try {
+      const stat = fs.statSync(fullPath);
+      entries.push({ relativePath, fullPath, size: stat.size, mtimeMs });
+    } catch {
+      // File may have been removed between walk and stat
+    }
+  }
+
+  return entries;
+}
+
 function getMainWindow(): BrowserWindow | null {
   const windows = BrowserWindow.getAllWindows();
   return windows.length > 0 ? windows[0] : null;