Admin section: complete the sidebar, kill double-edits, real Doctor #336

Job	Run time
JS lint & format	19s
Perf guards (Playwright)	1m 35s
JS typecheck	47s
Python tests	3m 15s
File size (300-line cap)	15s
E2E smoke (Playwright)	1m 49s
Python lint & format	16s
JS tests (Vitest)	26s
Python typecheck	15s
JS build (Vite)	45s
Package build (release dry-run)	12s
PR checks	2s
	9m 56s

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