fix(vscode): preserve draft when toggling sandbox

[marius-kilocode]

Sandbox controls are session-scoped, so toggling them from a new sidebar chat creates a backend session before the first message is sent. That session transition changed the prompt draft key from the new-chat bucket to the created session bucket, which restored an empty draft when no pending draft ID existed.

Preserve the active new-chat draft before requesting the sandbox transition, then migrate its text, review comments, and image attachments into the created session when the matching draftless sessionCreated event arrives. Other draftless session creation remains untouched, preserving draft isolation and normal send behavior.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (2 files)

• packages/kilo-vscode/tests/unit/prompt-input-connection-guard.test.ts
• packages/kilo-vscode/webview-ui/src/components/chat/PromptInput.tsx

Previous Review Summary (commit cbe29c6)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit cbe29c6)

Status: 1 Issue Found | Recommendation: Address before merge

Overview

Severity	Count
CRITICAL	0
WARNING	1
SUGGESTION	0

Fix these issues in Kilo Cloud

Issue Details (click to expand)

WARNING

File	Line	Issue
packages/kilo-vscode/webview-ui/src/components/chat/PromptInput.tsx	571	Draft edits made while sandbox session creation is pending can stay behind in the new bucket instead of following the created session.

Files Reviewed (5 files)

• .changeset/keep-sandbox-toggle-drafts.md - 0 issues
• packages/kilo-vscode/tests/unit/prompt-drafts.test.ts - 0 issues
• packages/kilo-vscode/tests/unit/prompt-input-connection-guard.test.ts - 0 issues
• packages/kilo-vscode/webview-ui/src/components/chat/PromptInput.tsx - 1 issue
• packages/kilo-vscode/webview-ui/src/utils/prompt-drafts.ts - 0 issues

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_{Reviewed by gpt-5.4-2026-03-05 · Input: 105.3K · Output: 26.8K · Cached: 1.6M}

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