Keep resumed chats on their saved sandbox

[charlesrhoward]

Summary

• let resumed native chats use their persisted, owned sandbox when the browser still has a different sandbox selected
• keep browser sandbox hints non-authoritative and cover the stale-hint case with a regression test

Privacy and compatibility

No schema or public API changes. Existing conversation ownership, repository ownership, and saved-sandbox validation remain enforced.

Verification

• focused native chat route and context tests
• ESLint (zero errors)
• TypeScript typecheck
• diff whitespace check

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[mogplex]

Mogplex PR Review

Status: No material issues found

Summary: The implementation matches the PR description: a stale browser-provided sandbox hint no longer prevents a resumed native chat from loading its persisted sandbox. Existing conversation ownership, repository scope, sandbox ownership, and sandbox/repository consistency checks remain intact.

Critical issues: None.

Warnings: None. The updated unit test verifies that the persisted sandbox is loaded and that its workspace and branch context are returned instead of the stale hint.

Suggestions: None.

Verdict: ✅ APPROVE — The change is narrowly scoped, preserves server-authoritative validation, and includes appropriate regression coverage.

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