left-sidebar
Domain: JupyterLab GUI
🎯 Motivation
The collapsible panel on the left of JupyterLab holding the file browser, running tabs, and command palette. Managed by ILeftSidebar.
📋 Concrete Example
Click the folder icon in the left sidebar to open the file browser; extensions add new sidebar tabs here.
🔗 Analogy
The left sidebar is a tool belt — your most-used tools hang on the left, one click away.