fix(tui): restore prompt on early escape

[PaiduiXiaowangzi]

Related Issue

Resolve #2781

Problem

See linked issue.

What changed

• Keep a directly submitted plain-text prompt restorable until thinking, assistant text, hook output, or a tool call becomes visible.
• Restore the prompt when Esc cancels during that window, preserving any newer editor draft and suppressing only the matching empty interruption marker.
• Preserve existing cancellation behavior after visible output and for queued, media, skill, plugin-command, shell, and Ctrl-C flows.

Verification

• vitest run apps/kimi-code/test/tui/kimi-tui-message-flow.test.ts --testNamePattern "pre-response cancellation|newer draft|after visible output" (3 passed)
• vitest run apps/kimi-code/test/tui/controllers/editor-keyboard.test.ts (28 passed)
• tsc -p apps/kimi-code/tsconfig.json --noEmit
• oxlint on all changed source and test files (0 errors)

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove my feature works.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3b052f1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@moonshot-ai/kimi-code	Patch

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