fix(mana/web+packages): clear all 270 warnings to zero

Comprehensive warning sweep across 128 files that brings svelte-check
from 270 warnings → 0 (plus 3 new errors from concurrent upstream
changes fixed inline).

Final state: 6473 files, 0 errors, 0 warnings, 0 files with problems.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/help/src/components/GettingStartedGuide.svelte

@@ -3,6 +3,7 @@
 
 	let { items, translations }: GettingStartedGuideProps = $props();
 
+	// svelte-ignore state_referenced_locally
 	let selectedGuideId = $state<string | null>(items.length > 0 ? items[0].id : null);
 
 	const guide = $derived(items.find((item) => item.id === selectedGuideId) ?? null);