App.tsx (routing + QueryClient), main.tsx (entry; index.html updated to
main.tsx), useAuth.tsx (typed AuthContextValue/User + MeResponse; uses the safe
useContext()||defaults pattern so no `never` trap), and the layout components
(Layout, Sidebar, NavPill, BrandBlock — NavItem type, LucideIcon-typed nav
config, casts for the untyped overdue/simplefin API responses). TS caught a dead
prop: App passed mainContentId to TrackerPage, which takes no params — removed.
typecheck 0, lint 0 errors (39 warns), build green, 17/17 e2e probe.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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