Ratatui Termina Backend

Render Ratatui frames through a [termina::Terminal].

[TerminaBackend] writes Termina CSI/SGR escape sequences for Ratatui's Backend contract: drawing cells, moving and querying the cursor, clearing regions, flushing output, and reading terminal size. It wraps a caller-provided [termina::Terminal], so applications can keep using Termina's event reader and typed terminal protocol surface alongside Ratatui rendering. The Termina crate is re-exported as ratatui_termina::termina, so callers can use the same Termina types as the backend.

The backend does not enter raw mode, switch to the alternate screen, enable bracketed paste, or install cleanup by itself. Configure those terminal modes with Termina before creating the backend and restore them when the session ends. The termina example in this crate shows the direct setup path with a small key-event loop.