Reset the tab feature flag cache between DOM tests so one authenticated response cannot leak into fallback cases, and make the trade execution failure spec submit a valid executable order before asserting the backend error alert. This closes the documented pre-existing web test failures and restores the full Vitest suite to green.
Refs: docs/AUDIT_REDESIGN.md items F7 and F8.
Co-Authored-By: GPT-5 Codex <noreply@openai.com>