[M8-T03] Write simulator E2E tests

## Task: M8-T03

**Milestone:** M8 - Playwright Tests (1 day)
**Feature:** RuleZ UI

## Description

Write E2E tests for the debug simulator functionality.

## Acceptance Criteria

- [ ] Test event form inputs
- [ ] Test simulation execution
- [ ] Test result display
- [ ] Test evaluation trace

## Dependencies

- Depends on: M8-T01, M6-T05