fix(e2e): observe generation through stable body

[vriesd]

Summary

• capture the stable document body before deterministic provider streaming starts
• poll that existing element for the expected heading, generated case, and completion status
• avoid a fresh selector lookup while the Tauri service and WebView are processing generation events
• retain the original 15-second completion budget and strict cancellation checks

Root cause

Failed Linux runs captured screenshots containing every expected value, but the new post-generation selector lookup did not complete before the assertion deadline. A timeout increase to 30 seconds reproduced the same failure, and an explicit Tauri window switch caused additional cross-platform direct-eval failures. Polling the pre-existing body avoids that unstable lookup while preserving all product assertions.

Validation

• targeted generation/cancellation built-app E2E passed locally in 2.9 seconds
• production E2E isolation passed
• release metadata for v0.7.21 passed
• code-size and diff checks passed

Failed evidence runs:

• https://github.com/ddv1982/qa-scribe/actions/runs/29868553335
• https://github.com/ddv1982/qa-scribe/actions/runs/29870402343
• https://github.com/ddv1982/qa-scribe/actions/runs/29871120482

[coderabbitai]

📝 Walkthrough

Walkthrough

The generation-cancellation end-to-end workflow now waits up to 30 seconds for the generated test cases element, increased from 15 seconds.

Changes

Generation cancellation workflow

Layer / File(s)	Summary
Generated test cases wait timeout e2e/specs/critical-workflows.e2e.mjs	Increases the generated.waitForDisplayed timeout from 15,000ms to 30,000ms.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: vriesdcrv

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is related to the e2e generation/cancellation timeout fix, though it is a bit more abstract than the code change.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/v0.7.21-recovery

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