feat(phase2): phase 6 - integration & polish

Fix all build/type/lint errors, write 60 new tests (175 total),
update seed with new widget types and team board permissions,
install missing svelte-i18n dependency, fix DynamicIcon for Svelte 5.

src/lib/components/section/DraggableSection.svelte

@@ -44,7 +44,7 @@
 
 	let {
 		section,
-		boardId,
+		boardId: _boardId = '',
 		apps,
 		onWidgetsUpdate,
 		addWidgetSectionId,
@@ -54,6 +54,9 @@
 		onDeleteWidget
 	}: Props = $props();
 
+	// boardId reserved for future per-section API calls
+	void _boardId;
+
 	let widgets = $state<WidgetData[]>([...section.widgets]);
 
 	// Keep local state in sync when parent data changes

src/lib/components/ui/DynamicIcon.svelte

@@ -18,10 +18,11 @@
 	}
 
 	const iconComponent = $derived(
-		name ? (icons as Record<string, unknown>)[toPascalCase(name)] ?? null : null
+		name ? ((icons as Record<string, unknown>)[toPascalCase(name)] as typeof import('svelte').SvelteComponent | undefined) ?? null : null
 	);
 </script>
 
 {#if iconComponent}
-	<svelte:component this={iconComponent} {size} class={className} />
+	{@const Icon = iconComponent}
+	<Icon {size} class={className} />
 {/if}

src/lib/components/widget/NoteWidget.svelte

@@ -37,6 +37,7 @@
 
 <div class="flex h-full flex-col rounded-xl border border-border bg-card p-4">
 	<div class="prose prose-sm prose-invert max-w-none flex-1 overflow-auto text-foreground">
+		<!-- eslint-disable-next-line svelte/no-at-html-tags -- content is sanitized above -->
 		{@html renderedContent}
 	</div>
 </div>