refactor(tests): remove sequential tags from test cases and enhance test result collection

.github/scripts/collect-failed-tests.js

@@ -0,0 +1,45 @@
+#!/usr/bin/env node
+// Walks Playwright JSON reporter output (one or more files) and writes a
+// deduped list of "file:line" locations for every test that ended up
+// "unexpected" (failed after all in-job retries), so a follow-up job can
+// re-run just those tests single-threaded.
+//
+// Usage: node collect-failed-tests.js <dir-of-json-reports> <output-file>
+
+const fs = require('fs');
+const path = require('path');
+
+const [, , reportsDir, outFile] = process.argv;
+
+if (!reportsDir || !outFile) {
+  console.error('Usage: collect-failed-tests.js <reports-dir> <output-file>');
+  process.exit(1);
+}
+
+const failed = new Set();
+
+function walkSuite(suite) {
+  for (const spec of suite.specs || []) {
+    const isFailed = (spec.tests || []).some(test => test.status === 'unexpected');
+    if (isFailed) {
+      failed.add(`${spec.file}:${spec.line}`);
+    }
+  }
+  for (const child of suite.suites || []) {
+    walkSuite(child);
+  }
+}
+
+const files = fs.existsSync(reportsDir)
+  ? fs.readdirSync(reportsDir).filter(f => f.endsWith('.json'))
+  : [];
+
+for (const file of files) {
+  const report = JSON.parse(fs.readFileSync(path.join(reportsDir, file), 'utf8'));
+  for (const suite of report.suites || []) {
+    walkSuite(suite);
+  }
+}
+
+fs.writeFileSync(outFile, Array.from(failed).sort().join('\n'));
+console.log(`Found ${failed.size} failed test file(s) across ${files.length} report(s).`);