Use the Bubbles v2 component library (charm.land/bubbles/v2, charmbracelet bubbles) inside a Bubble Tea v2 TUI: list, table, viewport, textinput, textarea, spinner, progress bar, filepicker, tree, paginator, timer, stopwatch, help, and key bindings. Use when adding a ready made widget or TUI component (text input, spinners, scrolling view, file picker) to a terminal app, wiring its focus, size, styles, and messages, or migrating v1 bubbles code. Not for the program loop itself (charmed-bubbletea), raw styling (charmed-lipgloss), or whole forms (charmed-huh).