Dead imports and locals removed, each blocks keyed, `any` narrowed to unknown.
Two context setters kept their calls and lost only the unused binding; the
settings redirect no longer awaits a parent whose data it discards. A leading
underscore now marks a binding that only holds a position.
The RequestHandler import sat commented out while all four handlers were
annotated with it, so every destructured parameter was an implicit any --
24 of the 30 svelte-check errors. deleteFn returned `{}`, which void is not
assignable to.