fix: Fix filepath splitting, fix slivers on scanner page

lib/core/service/file_description.dart

@@ -0,0 +1,20 @@
+class FileDescription {
+  final String filename;
+  final String extension;
+
+  FileDescription({
+    required this.filename,
+    required this.extension,
+  });
+
+  factory FileDescription.fromPath(String path) {
+    final filename = path.split(RegExp(r"/")).last;
+    final fragments = filename.split(".");
+    final ext = fragments.removeLast();
+    final name = fragments.join(".");
+    return FileDescription(
+      filename: name,
+      extension: ext,
+    );
+  }
+}