Repair Dataset Viewer layout (1 Parquet shards)

Rewrite audio Parquet files with 100-row groups and page indexes to stay below the Dataset Viewer scan limit.

data/train-00000-of-00018.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:16994fe63ba12c8356b265cc1704ae2d634bff25811cd9b8f861a2ed443862c1
-size 493092442
+oid sha256:e72b6f83262b2cf867882b44406e6d0c1b090a6b4e3dd0bd86774ba084230e53
+size 493108981

dataset-viewer-repair-state.json

@@ -0,0 +1,8 @@
+{
+  "done": [
+    "data/train-00000-of-00018.parquet"
+  ],
+  "repo": "anquachdev/PhoMT-en-vi-speech",
+  "row_group_rows": 100,
+  "version": 1
+}