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/routes/(root)/settings/devices/+page.svelte

@@ -130,7 +130,7 @@
 					</Table.Row>
 				</Table.Header>
 				<Table.Body>
-					{#each data.devices as device}
+					{#each data.devices as device (device.id)}
 						{@const isVisible = visibleApiKeys.has(String(device.id))}
 						<Table.Row class="h-14">
 							<Table.Cell class="pl-4 font-medium">