fix(tui): sanitize background task output

[LouisDM]

Related Issue

Refs #2233

Problem

Background task output is rendered directly inside the /tasks preview and full output viewer. Shell output can contain carriage returns and cursor-control sequences; when those bytes reach a framed pane, the terminal can move the cursor and overwrite pane borders. This matches the split-pane corruption reported on Windows Terminal.

What changed

• sanitize captured task output at both framed TUI sinks using the existing sanitizeShellOutput helper
• add regressions for carriage-return progress output and CSI clear-screen sequences in both views
• add a patch changeset for @moonshot-ai/kimi-code

Verification

• pnpm exec vitest run apps/kimi-code/test/tui/tasks-browser.test.ts apps/kimi-code/test/tui/task-output-viewer.test.ts (61 passed)
• pnpm exec vitest run apps/kimi-code/test/tui/utils/shell-output.test.ts (17 passed)
• pnpm --filter @moonshot-ai/kimi-code typecheck
• type-aware oxlint on all four changed TypeScript files
• pnpm changeset status --since origin/main
• git diff --check

The byte-level regression is deterministic in a headless terminal. Native Windows Terminal split-pane validation remains useful during review.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue, or explained the problem above.
• I have added tests that prove the fix works.
• Ran gen-changesets and added a patch changeset.
• Ran gen-docs; this fix does not require a documentation update.

[changeset-bot]

🦋 Changeset detected

Latest commit: de04114

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

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR