Identify and implement top five code reduction

Identify top 5 opportunities to massively reduce the amount of code (lines of code) in any part of the repo: - Similar functionality that can be unified and reused - Code that has been valuable but no more - A front end component or a group of them duplicate another component/page functionality. Use the most modern and nice looking - etc. Now implement them :)

Round eight of top-five code reductions: GateForm test builder, one live edition-mock home (8 suites), six web production clones folded, four API single-homes, 31 Python test helpers hoisted; net −527 lines, no behaviour change. Quick gate, whole web suite, 74 API suites, jaahd/infra green; blind code+security lanes pass. PR #7406 merged by the lane (94ef394e2), Jaah Deploy success. Deferred: NodeDetailPage Dead runs → Audit Sessions link (product change). Memory: none applied; proposed 1 gotcha.