Add Command bar for improved productivity

Editor assessment

The subject states the feature and its purpose in one line, a command bar added for improved productivity, and that inline rationale is welcome even if 'improved productivity' is generic. Feat is right. What is missing is any body on the surface: which commands exist, what the invocation UI looks like, and how it relates to keyboard shortcuts. No scope, no footers beyond Co-authored-by. The trailing pull-request number is conventional. Hygiene is fine. Understandable and mildly motivated, thin on the feature's actual shape.