Database CSV export cuts off long JSON cells

# Bug report - [x] I confirm this is a bug with Supabase, not with my own application. - [x] I confirm I have searched the [Docs](https://docs.supabase.com), GitHub [Discussions](https://github.com/supabase/supabase/discussions), and [Discord](https://discord.supabase.com). ## Describe the bug When exporting database rows through the web interface, JSON cells with more that ~10 000 characters are cut off in the resulting CSV file (not sure about other data types). I don't know if that was intended somewhere somehow, but it makes the data export useless, as well as dangerous because it silently omits data, and also makes the json content malformed. Hope this can be fixed. ## To Reproduce Steps to reproduce the behavior, please provide code snippets or a repository: 1. Go to the table editor in the web interface and view a table. 2. Select one or multiple rows that have a JSON cell with more than ~11k characters 3. Click the Export to CSV button above. 4. Observe the resulting CSV file and see how not all the content of the JSON cell is in there. ## Expected behavior To download a CSV file with the full content of all selected rows and their cells. ## Screenshots This is what the cut off point in the CSV looks like: <img width="313" height="22" alt="Image" src="https://github.com/user-attachments/assets/dac4fe26-3168-4e3e-b7a3-1763967b455e" /> ## System information - OS: Windows 10 - Browser: Firefox v140