## Summary
- Updated stale aria snapshot for `partial_response.spec.ts` that was
consistently failing
- Button text content now renders actual text (e.g., `file1.txt
file1.txt`, `Edit`, `Undo`, `Retry`) instead of empty strings
- Removed `wrote 1 file(s)` text entries that no longer appear in the UI

## Context
Scanned 5 recent CI runs on main and 13 open PRs by
wwwillchen/wwwillchen-bot/dyadbot. Found flaky tests across 16+ spec
files. Most flakiness is CI-specific (timing/load dependent) and cannot
be reproduced locally with 10x repeats. The `partial_response.spec.ts`
snapshot was the only consistently broken test.

## Test plan
- [x] `partial_response.spec.ts` passes 10/10 times locally with updated
snapshot
- [x] Full E2E suite passes (236/243, with only transient flaky failures
unrelated to this change)

🤖 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>