web: unify empty + loading states behind EmptyState/InlineLoader

Replaces ad-hoc "Loading…" text and bare empty messages with two
shared feedback primitives that carry subtle lucide icons, consistent
muted-foreground/destructive tones, and a11y signaling (role=status,
aria-busy, role=alert on destructive empties). Loading copy gains
context ("Loading photos/folders/heaps/metadata…") and the right-
sidebar idle state moves from a "ⓘ" glyph to a MousePointerClick
icon. SkeletonGrid stays as the initial-grid loader.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/routes/review/+page.svelte

@@ -51,6 +51,8 @@
 	import BulkMetadataSidebar from '$lib/components/sidebar/BulkMetadataSidebar.svelte';
 	import CauseGroupCard from '$lib/components/review/CauseGroupCard.svelte';
 	import DuplicatesView from '$lib/components/duplicates/DuplicatesView.svelte';
+	import { EmptyState, InlineLoader } from '$lib/components/feedback';
+	import { AlertCircle, Sparkles } from 'lucide-svelte';
 
 	type DupTab = 'stacks' | 'cross-folder';
 	type Tab = CauseKey | DupTab;
@@ -226,23 +228,27 @@
 		<div class="flex min-w-0 flex-1 flex-col">
 			<main class="min-h-0 flex-1 overflow-y-auto px-6 py-4 pb-6" use:gridKeyNav={{}}>
 				{#if reviewQuery.isPending}
-					<p class="text-sm text-muted-foreground">Loading review queue…</p>
+					<InlineLoader label="Loading review queue…" />
 				{:else if reviewQuery.error}
-					<p class="text-sm text-destructive">
-						Could not load review queue: {reviewQuery.error instanceof Error
+					<EmptyState
+						tone="destructive"
+						icon={AlertCircle}
+						title="Could not load review queue"
+						description={reviewQuery.error instanceof Error
 							? reviewQuery.error.message
 							: 'unknown error'}
-					</p>
+					/>
 				{:else if groups.length === 0}
-					<div class="max-w-prose space-y-2 text-sm text-muted-foreground">
-						<p>The review queue is empty.</p>
-						<p class="text-xs">
-							PhotoPrism's indexer flags photos with a low quality score for human
-							review. New arrivals with missing EXIF, low resolution, or unknown
-							cameras will land here. The Stacks and Cross-folder tabs above stay
-							available for duplicate cleanup.
-						</p>
-					</div>
+					<EmptyState icon={Sparkles} title="Nothing to review">
+						{#snippet descriptionSnippet()}
+							<p>
+								PhotoPrism's indexer flags photos with a low quality score for human
+								review. New arrivals with missing EXIF, low resolution, or unknown
+								cameras will land here. The Stacks and Cross-folder tabs above stay
+								available for duplicate cleanup.
+							</p>
+						{/snippet}
+					</EmptyState>
 				{:else if activeGroup}
 					{#key activeGroup.cause}
 						<CauseGroupCard group={activeGroup} />
@@ -263,7 +269,7 @@
 					{:else if focusedPhotoQuery.data}
 						<RightSidebar photo={focusedPhotoQuery.data} showRelated />
 					{:else if focusedPhotoQuery.isFetching}
-						<p class="px-3 py-2 text-xs text-muted-foreground">Loading…</p>
+						<InlineLoader size="sm" label="Loading metadata…" />
 					{/if}
 				</div>
 				<div