## TL;DR

Adds `cmd-shift-v` / `cmd-k v` (ctrl on linux/windows) to open the
tabular data preview for `csv`/`tsv`/`ssv`/`psv` files, mirroring the
existing `markdown::OpenPreview(ToTheSide)` and
`svg::OpenPreview(ToTheSide)` bindings/context pattern already in the
default keymaps.

Extension check kept explicit (not just `"Editor"`) so it doesn't
compete with the `md`/`svg` blocks bound to the same keys on their own
extensions.

## Testing

- Manually verified `cmd-shift-v` / `cmd-k v` open tabular data preview
on `.csv`/`.tsv`/`.ssv`/`.psv` files, no-op on other extensions.

## 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:

- Added shortcuts to open the tabular data preview for CSV/TSV/SSV/PSV
files (similar to md/svg preview)

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Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com>