chore: clear the mechanical lint and type findings

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.

frontend/src/lib/components/view/book-table.svelte

@@ -2,7 +2,6 @@
 	import { resolve } from '$app/paths';
 	import * as Table from '$lib/components/ui/table/index';
 	import * as DropdownMenu from '$lib/components/ui/dropdown-menu/index';
-	import * as Tooltip from '$lib/components/ui/tooltip/index';
 	import { Checkbox } from '$lib/components/ui/checkbox/index';
 	import { Badge } from '$lib/components/ui/badge/index';
 	import { buttonVariants } from '$lib/components/ui/button/index.js';