feat: data export — CSV/Excel for Postgres/SQLite, JSON for MongoDB

[pavi2410]

Summary

• Adds CSV and Excel (.xlsx) export to all Postgres and SQLite query editors and data viewers via an Export toolbar popover
• Adds JSON export to MongoDB document viewer and pipeline builder
• New widgets/export.rs module handles serialisation (csv + rust_xlsxwriter + serde_json) and the native save-file dialog (rfd)
• After a successful save, a success toast fires with two explicit action buttons: Open file and Show in Finder / Show in Explorer / Open Folder
• No implicit click-to-open on the notification body; autohide is disabled so the user has time to act

Test plan

• Run a query in the Postgres/SQLite query editor → click Export → save as CSV and verify the file opens correctly in a spreadsheet app
• Save as Excel (.xlsx) and verify bold headers + data rows
• Browse a table in the data viewer → export CSV/Excel
• Run a MongoDB aggregation pipeline → export JSON and verify array-of-objects structure with null for missing/NULL values
• Verify the success toast appears after each export with both Open file and Show in Finder buttons working correctly
• Cancel the save dialog → confirm no toast is shown

Made with Cursor

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	based	959ed5e	Commit Preview URL Branch Preview URL	Jun 03 2026, 03:51 AM