fix(browser): encode iframeId in tester iframe URL [backport to v4] - #10955
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Backport of #10521 to
v4.createTestIframebuilds the tester iframe URL by interpolating the test-file path (iframeId) into the query string without encoding. A+in the path is decoded back as a space, so the spec no longer matches a real file, the iframe never runs the test, and browser mode hangs at0 passedwith no error. Encode the value withencodeURIComponent; it is read back with standard URL decoding (URLSearchParams.get).Clean cherry-pick of c8bf19f apart from one context-only conflict in
orchestrator.ts(const config = getConfig()exists only onmain). Includes the regression test from the original PR.