Keep original formatting in compiled text entry strings

- Explicity split entry string by space during split by max_tokens
- Prevent formatting of compiled entry from being lost
- The formatting itself contains useful information
  No point in dropping the formatting unnecessarily,
  even if (say) the currrent search models don't account for it (yet)

tests/test_org_to_jsonl.py

@@ -44,7 +44,7 @@ def test_entry_split_when_exceeds_max_words(tmp_path):
     # Arrange
     entry = f"""*** Heading
     \t\r
-    Body Line 1
+    Body Line
     """
     orgfile = create_file(tmp_path, entry)