Right-click on an entry opens a context menu with operations that apply to it (open, reveal, copy path, …); right-click on blank space opens a smaller menu rooted at the panel itself (refresh, change sort, …). Navigation is keyboard or mouse; pressing the same key again closes the menu. Lives in its own `context_menu` submodule — the menu's data model, rendering, and event handling form a coherent unit large enough to be its own concern from birth.