gpui: Add tab group (#38531)

Closes #ISSUE

Co-Authored-By: Mikayla <mikayla@zed.dev>
Co-Authored-By: Anthony <anthony@zed.dev>
Co-Authored-By: Kate <kate@zed.dev>

Release Notes:

- N/A *or* Added/Fixed/Improved ...

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Co-authored-by: Kate <kate@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.dev>
Co-authored-by: Anthony <anthony@zed.dev>
Co-authored-by: Mikayla Maki <mikayla.c.maki@gmail.com>
50bb8a4ae6Ben Kunkle committed on 9/25/2025, 2:41:29 PM· committed by GitHubparentb2b90b0
5 files changedLine totals unavailable