ci: upload playwright artifacts for flaky retries

[Hona]

Summary

• add a Playwright JSON report so CI can detect when retries converted a failure into a flaky pass
• upload Playwright traces, test results, and the HTML report when the e2e job fails or when flaky retries are detected
• keep artifact retention and paths unchanged so failed retry attempts stay downloadable from the same workflow run

Testing

• bun typecheck

[Copilot]

Pull request overview

Adds Playwright JSON reporting and CI logic to detect flaky retries and upload e2e artifacts not only on failures, but also when retries turn failures into flaky passes—making flakes visible/downloadable from the same workflow run artifacts.

Changes:

• Add Playwright JSON reporter output (results.json) alongside the existing HTML + line reporters.
• Add a CI step to parse the JSON report and detect flaky tests.
• Upload Playwright artifacts when the job fails or when flaky retries are detected.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/app/playwright.config.ts	Adds JSON reporter output to enable CI-side flaky detection.
.github/workflows/test.yml	Detects flakes from the JSON report and uploads Playwright artifacts on failure or flake.

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[Copilot]

The flake-detection script will throw and fail the workflow if results.json exists but is malformed/partial (e.g., Playwright process interrupted, file truncated). Since this step runs if: always(), a parse error could incorrectly turn an otherwise-successful run into a failed job. Consider wrapping the JSON read/parse in try/catch and defaulting outputs to flaky=false (or emitting a separate flaky_parse_error output) instead of letting the step fail.

Suggested change

	const report = JSON.parse(fs.readFileSync(file, "utf8"))
	const count = Number(report?.stats?.flaky ?? report?.suitesSummary?.flaky ?? 0)
	fs.appendFileSync(process.env.GITHUB_OUTPUT, `flaky=${count > 0}\nflaky_count=${count}\n`)
	try {
	const raw = fs.readFileSync(file, "utf8")
	const report = JSON.parse(raw)
	const count = Number(report?.stats?.flaky ?? report?.suitesSummary?.flaky ?? 0)
	fs.appendFileSync(
	process.env.GITHUB_OUTPUT,
	`flaky=${count > 0}\nflaky_count=${count}\n`
	)
	} catch (error) {
	console.error("Failed to read or parse Playwright results.json for flake detection:", error)
	fs.appendFileSync(process.env.GITHUB_OUTPUT, "flaky=false\nflaky_count=0\n")
	process.exit(0)
	}