Identify top 5 opportunities to massively reduce

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 :)

No ungated LOC cut left: product dup 0.07%, test dup 0.09%, no dead modules/exports, vendor trimmed. Five large cuts are gated (skynet aliases ~2.2k on fleet naming, not confirmed by the operator; _legacy_* columns on a two-release migration; OpenAPI types and useAsyncResource need specs; live-fleet backstops). Residue <120 lines, named in the report. No PR. Memory used: mem-15536, mem-16980, mem-16764, mem-5787, mem-12787, mem-5120, mem-16492.