[FEATURE]: Double-ESC should cancel the running turn and submit any draft messages #26748

Feature hasn't been suggested before.

• I have verified this feature I'm about to request hasn't been suggested before.

Describe the enhancement you want to request

Today, redirecting opencode mid-turn takes too many keystrokes:

1. See it going the wrong way
2. Type a correction and hit Enter — lands as a draft, waiting for the current turn
3. Double-ESC to cancel the running turn
4. Draft is still sitting there, doesn't get sent
5. Up to recall it
6. Enter to submit

Proposal: if there are draft messages waiting when double-ESC fires during an active turn, cancel the turn and submit the drafts as the next prompt. If no drafts, double-ESC behaves as it does today.

Claude Code does the equivalent on a single ESC and it's a noticeably tighter loop for steering long-running tasks.

Related but distinct from the broader queue/interrupt threads (#5333, #16102, #21388) — this is just about what happens to drafts at the moment of cancel.