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Export/Import improvements: - Replace pagination with direct SQL query (db_sqlite_get_all_chat) - Wrap import in SQL transaction with rollback on error - Add fsync before fclose in export for data safety - Sort merged output by timestamp with secondary key (stanza_id, from_jid) - Export archive_id and marked_read from SQLite (lossless migration) - Add progress indication every 500 messages during write/import - Expand dedup key body prefix from 64 to 256 chars - Fix g_slist_append O(n²) → g_slist_prepend + g_slist_reverse O(n) Field parity (to_jid, to_resource, marked_read): - Add fields to ff_parsed_line_t struct - Write/parse to:|to_res:|read: metadata tags in flatfile format - Pass to_resource through _ff_add_message and all callers - Add marked_read to ProfMessage struct with -1 default (unset) - Preserve fields across export/import round-trips Tests (19 new: 11 unit + 8 functional): - Unit: to_jid_and_marked_read, bracket_in_stanza_id, backslash_in_resource, mucpm_type, all_enc_types, crlf_handling, to_jid_special_chars, multiple_lines, parsed_line_free_null_safe, no_space_rejected, unclosed_bracket - Functional: export_idempotent_no_duplicates, export_lmc_correction_survives, switch_preserves_old_backend_data, export_all_contacts, import_double_dedup, verify_after_export, switch_backends_independent_messages, export_empty_contact - Rebalance test groups: move Chat Session from Group 3 to Group 4 (25/33/30/27 instead of 25/33/36/21) - Remove hardcoded test counts from group comments Man page: - Document /history switch sqlite|flatfile