Function create_branch_and_switch 

pub(crate) fn create_branch_and_switch(branch_name: &str) -> Result<()>

Creates a new local branch (if desired) and switches to it.

Behaviour:

• if both the current branch and the target branch are non‑default (not main / master) user confirmation is required.

Errors

• Current branch discovery via ytil_git::branch::get_current fails.
• Branch creation via ytil_git::branch::create_from_default_branch or subsequent switching via ytil_git::branch::switch fails.
• Reading user confirmation input fails.