Issue description

When typing "zellij a" followed by Tab in bash shell, Zellij does not show the list of available sessions for completion. However, this works correctly in fish shell. The expected behavior is that bash should show session completion similar to fish.

Affected shells: bash
Working shells: fish
OS tested: Ubuntu 22.04, Fedora 43
Zellij version: 0.43.1

Minimal reproduction

1. Start a bash shell session
2. Type zellij a followed by Tab key
3. Observe: No session list appears for completion
4. Compare with fish shell where typing zellij a + Tab correctly shows available sessions