## Summary
- Fixed flaky `refresh app` test in `refresh.spec.ts` by adding
pre-refresh snapshot verification and post-refresh content wait
- The test was failing ~20% of the time because the iframe body would
remain empty after clicking refresh
- Added `snapshotPreview()` before body removal to ensure initial
content is loaded
- Added `not.toHaveText("")` wait after refresh to ensure content
reloads before snapshotting

## Flaky test analysis

Scanned 1 main branch CI run (with available artifacts) + 9 PR comments
from wwwillchen/wwwillchen-bot. Top flaky spec files by occurrence:

| Spec File | Occurrences | Status |
|:---|:---:|:---|
| setup_flow.spec.ts | 13 | Already fixed (PR #2740) |
| debugging_logs.spec.ts | 6 | Stable (passed 50/50) |
| select_component.spec.ts | 6 | Stable (passed 60/60) |
| setup.spec.ts | 5 | Stable (passed 10/10) |
| switch_versions.spec.ts | 5 | Stable (passed 20/20) |
| **refresh.spec.ts** | **5** | **Fixed in this PR** |
| toggle_screen_sizes.spec.ts | 4 | Stable (passed 30/30) |
| undo.spec.ts | 3 | Stable (passed 30/30) |

## Verification
- `refresh.spec.ts` passed 40/40 runs with `--repeat-each=10` after the
fix (was 38/40 before)

## Test plan
- [x] Verify `refresh.spec.ts` passes consistently with
`--repeat-each=10`
- [x] No application code changes (test-only fix)

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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Co-authored-by: claude[bot] <41898282+claude[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>