Ref-name inputs only validated after the fact, so a space typed or pasted into a branch name showed "Branch name contains invalid characters" and disabled Create. Branch-name fields (New Branch, from a revision and in several repositories, Rename Branch, New Worktree, GitHub New Remote Branch) now clean the name while typing: forbidden characters are dropped and whitespace becomes '-', without stacking separators, keeping the caret in place. Shared via src/platform/gitRefName.ts and the useSanitizedField hook in src/ui.
Closes#1553
Co-authored-by: jaw52 <53564781+jaw52@users.noreply.github.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
