* feat: allow custom worktree branch names
* refactor(ui): render custom branch name field unconditionally under advanced container
* fix(composer): hide manual branch field when a work-item source drives the branch
A tracked PR/issue/MR/Linear source derives the branch itself, and a linked
GitHub PR re-resolves the branch name at submit — so an override typed in the
Advanced branch field was silently ignored. Only render the field for the
typed-name and base-branch flows, where the manual override is honored.
Co-authored-by: Orca <help@stably.ai>
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Co-authored-by: Wolfgang Schoenberger <221313372+wolfiesch@users.noreply.github.com>
Co-authored-by: Neil <4138956+nwparker@users.noreply.github.com>
Co-authored-by: Orca <help@stably.ai>