## Why
The startup composer accepted edits but ignored submission. Its first frame also preceded configured screen settings, and startup failures could leave typed text unavailable.
## What changed
- Honor configured submit bindings during startup, retaining one confirmation until the session and protected input screens are ready. Repeated submit keys do not duplicate the message; edits, `Esc`, disconnects, or destination changes cancel confirmation while preserving the draft.
- Apply local screen, status-line, keymap, and paste settings before the first editable frame. Anchor the composer at the bottom in owned-screen mode and retain the loading frame until resumed history is ready to render.
- Keep an in-memory recovery copy through submission acknowledgment. On startup failure, restore the terminal before printing unsent text, expanding paste placeholders and escaping terminal control characters.
## Testing
Add regression coverage for deferred single submission, configured key chords, cancellation, protected input, paste handling, draft recovery, initial screen settings, and loading-frame handoff, plus a startup layout snapshot.
GitOrigin-RevId: 1eb4c63027f7d59af5d42d8545cd5cb5c3594306
Eric Traut
9ed1b74699