key_hints

Build the navigation hint for modals whose Tab keys move the cursor.

Only for screens where Tab and Shift+Tab step the selection. A modal that binds Tab to something else writes its own line rather than using this one -- mcp_viewer (Tab jumps between servers), model_selector (Tab autocompletes), and plugin_manager (Tab cycles tabs) all do.

The hint is long enough to wrap once a modal narrows, so the host Static needs height: auto to grow and dock: bottom to reserve the extra row. Without the dock the wrapped row is laid out past the modal's bottom edge, where the compositor never paints it.

Character glyphs for TUI display.