style: remove redundant comments in RowParser (cleanup batch 1)

[datlechin]

First batch of the no-comments cleanup. Removes 9 comments in RowParser that only restate the line below them (// Split into lines above a components(separatedBy:), // Pad with NULL for missing columns, etc.). Code is untouched; the diff is comment-only.

Kept on purpose: the hand-rolled CSV state-machine comments (CRLF handling, RFC 4180 escaped-quote rule) that actually help follow the scanner, and all /// doc comments and // MARK: markers.

This is batch 1 of a larger sweep. See the PR discussion note about scope.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve NUL bytes in query-result SQL exports

When exporting non-streaming query results, ExportDialog creates ExportService(databaseType:), so QueryResultExportDataSource has no driver and SQL export text cells flow through this fallback before SQLExportPlugin writes the INSERT values. Switching the fallback to SQLEscaping.escapeStringLiteral now strips embedded \0 bytes, whereas the previous implementation only doubled quotes, so a text value such as "a\0b" is exported as 'ab' and a round-trip silently loses data.

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