## TL;DR

`TabularDataPreviewPane` did rendering, focus, engine, and settings all
in one component.

Extracted the table-rendering half into `TableView` (new
`table_view.rs`), so the pane now owns tab/item concerns and just embeds
`self.table: Entity<TableView>` which allows the table to be reusable in
other contexts (i.e. multiple tables per pane or rendering data from
other sources like DB client).

> NOTE: No behavior changes. Only refactoring

## Testing

- `cargo check -p tabular_data_preview`, `./script/clippy` clean.
- Tested manually: no UI/UX/performance regressions

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [ ] Unsafe blocks (if any) have justifying comments
- [x] UI standards followed
- [ ] Tests cover the new/changed behavior
- [x] Performance impact considered, acceptable

Release Notes:

- N/A