feat: filesystem and Files app support for >64 file entries, 64-bit sizes, async ops, GUI toolkit improvements to devexplorer app

kernel/src/Fs/Vfs.cpp

@@ -374,17 +374,30 @@ namespace Fs::Vfs {
     }
 
     int VfsReadDir(const char* path, const char** outNames, int maxEntries) {
+        return VfsReadDirAt(path, outNames, maxEntries, 0);
+    }
+
+    int VfsReadDirAt(const char* path, const char** outNames, int maxEntries, int startIndex) {
         int drive;
         const char* localPath;
 
+        if (startIndex < 0) return -1;
         if (!ParsePath(path, drive, localPath)) return -1;
         if (drive < 0 || drive >= MaxDrives || !driveActive[drive] || driveTable[drive] == nullptr) return -1;
 
         vfsLock.Acquire();
         FsDriver* driver = driveTable[drive];
-        int result = (driveActive[drive] && driver && driver->ReadDir)
-            ? driver->ReadDir(localPath, outNames, maxEntries)
-            : -1;
+        int result;
+        if (!driveActive[drive] || !driver) {
+            result = -1;
+        } else if (driver->ReadDirAt) {
+            result = driver->ReadDirAt(localPath, outNames, maxEntries, startIndex);
+        } else if (driver->ReadDir) {
+            // Driver without pagination support: only the first page is reachable.
+            result = (startIndex == 0) ? driver->ReadDir(localPath, outNames, maxEntries) : 0;
+        } else {
+            result = -1;
+        }
         vfsLock.Release();
         return result;
     }