Feat/cs/project parser bytes

[ReagentX]

Changes

• Parse body and edit data directly from borrowed SQLite row bytes
  • Return messages with parsed body fields
  • Remove the public parse/apply lifecycle and obsolete body loader
  • HTML export time decreased ≈5% and TXT ≈8%, with ≈15 MB more peak memory
  • Preserve recovered body components and edit/unsent metadata when legacy text parsing fails

Migration guide:

Message queries now populate text, components, and edited_parts automatically. What was previously expressed as:

let mut message = Message::from_guid(guid, &db, &capabilities)?;
if let Ok(body) = message.parse_body(&db) {
    message.apply_body(body);
}

is now much more elegantly expressed as:

let message = Message::from_guid(guid, &db, &capabilities)?;

The same applies to messages returned by streaming, row iteration, and reply queries. Query and callback signatures are unchanged.

• Breaking changes:
  • parse_body, apply_body, and ParsedBody have been removed.
  • attributed_body() and generate_text_legacy() are removed. Use the populated message fields; raw bytes remain accessible through SQL or Table::get_blob.
  • Custom SQL should project the available attributedBody, message_summary_info, and (payload_data IS NOT NULL) AS has_payload_data inputs. Raw payload_data from m.* is also supported. Cast text-valued
    parser inputs to BLOB in UTF-16 databases.