Add idempotent favourite toggle unit test
Lane round 2 C: test/favourites.test.js only — add one unit test that toggling the same favourite twice leaves the list unchanged. No source change.
Outcome
Added one test to test/favourites.test.js: toggling the same favourite twice leaves the list unchanged. No source change. Quick gate green (109/109); PR #21 merged into develop by the merge lane.
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