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Fix structured API returning blank data for field-based canvases (#5640)

* Initial plan

* Fix structured API returning blank data for canvases with transcription_json

The field_data_to_hash method in export_helper.rb only read structured data
from page.table_cells. Modern field-based transcriptions store data in
page.transcription_json but NOT in table_cells, causing blank data: []
responses for newer transcriptions.

Fix: When transcription_json is present, use it to build the structured
data response. Fall back to table_cells for legacy pages that predate
the transcription_json storage format.

Closes #5639

* Remove table_cells dead code; read only from transcription_json

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