Identify and implement top 5 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 :)

Implemented the five largest defensible code consolidations (node token dialog, compliance pills on StatusChip, audit lists on useListPage/ListPager, one billing remove/cancel dialog, shared OAuth connect skeleton + Slack cap); quick gate green, review lane passed; PR #7591 queued to the merge lane. No massive mechanical reduction remains: the big levers (Windows/macOS support, legacy runtime, agent-connectors mirror) are product decisions named in the report. Visual check done on this slot's stack: shared pager footers clean at desktop and 448px. Memory: used mem-32704, mem-32769, mem-31277; proposed 1 qa.