fix(vscode): prevent drained questions from reappearing

[marius-kilocode]

Settings saves reject pending questions and clear the UI, but a delayed recovery scan can replay an old question before the rejection SSE arrives.

Invalidate recovery immediately after a successful rejection or NotFound response, using the existing revision guard. Keep the fix to one production line; snapshot backend behavior is unchanged.

The focused regression covers both outcomes and verifies invalidation before the clear notification. It fails without the fix and passes with it. All 19 focused tests, extension/webview typechecks, lint, knip, and the change-marker guard pass. The live VS Code heavy-load scenario was not exercised.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (3 files)

• .changeset/clear-drained-question-recovery.md
• packages/kilo-vscode/src/services/cli-backend/connection-service.ts
• packages/kilo-vscode/tests/unit/connection-service-question.test.ts

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_{Reviewed by grok-4.6 · Input: 52.2K · Output: 7.1K · Cached: 317.2K}

_{Review guidance: REVIEW.md from base branch main}

[WebReflection]

nice!