feat(cli): replace tmux with zellij

[repparw]

Summary

• add a Home Manager-backed Zellij aspect
• switch the repparw profile from den.aspects.tmux to den.aspects.zellij
• replace SSH tmux auto-attach with zellij attach ssh --create

Notes

• keeps auto-attach limited to SSH shells instead of enabling Zellij globally for every local terminal
• enables Zellij session serialization and viewport serialization to cover the main tmux-resurrect/continuum use case
• leaves the existing tmux aspect available but no longer included in the repparw profile

Testing

• Not run; change created through GitHub connector only.

[Copilot]

Pull request overview

This PR migrates the repparw user profile from tmux to Zellij by introducing a Home Manager-backed Zellij aspect and updating the SSH auto-attach behavior in the fish shell aspect.

Changes:

• Add a new den.aspects.zellij aspect configuring Zellij via Home Manager.
• Switch the repparw profile to include den.aspects.zellij instead of den.aspects.tmux.
• Update fish SSH auto-attach logic to use zellij attach ... --create.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
modules/aspects/repparw.nix	Switches the repparw profile composition from tmux to zellij.
modules/aspects/cli/zellij.nix	Adds a Home Manager Zellij aspect with desired settings.
modules/aspects/cli/shell.nix	Replaces tmux SSH auto-attach with Zellij auto-attach in fish init.

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