iOS: Add poll support, fix contact name resolution, fix typos

- Add poll message decoding for iOS (ZMESSAGETYPE 46) using raw protobuf
  parsing of ZWAMESSAGEINFO.ZRECEIPTINFO blobs (no external dependency).
  Polls render with vote tallies and voter names in the HTML export.
- Fix iOS contact name resolution: pull ZFULLNAME from address book,
  resolve LID-based group members, fall back to ZWAPROFILEPUSHNAME,
  and avoid overwriting real names with phone numbers.
- Fix typo: 'expoter' -> 'exporter' in android_crypt.py and __main__.py.
- Add poll field to Message data model and update test fixtures.

Whatsapp_Chat_Exporter/android_crypt.py

@@ -198,7 +198,7 @@ def _decrypt_crypt14(database: bytes, main_key: bytes, max_worker: int = 10) ->
                 f"The offsets of your IV and database are {start_iv} and {start_db}, respectively."
             )
             logging.info(
-                f"To include your offsets in the expoter, please report it in the discussion thread on GitHub:"
+                f"To include your offsets in the exporter, please report it in the discussion thread on GitHub:"
             )
             logging.info(f"https://github.com/KnugiHK/Whatsapp-Chat-Exporter/discussions/47")
             return result