fix: resolve all lint errors across source and test files

- Fix unused function parameters (prefix with _)
- Fix unused imports in test files
- Fix import ordering in test files
- Auto-fix formatting issues across 22 files

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

src/client/components/CandidateCard.tsx

@@ -34,7 +34,7 @@ export function CandidateCard({
 	priceCents,
 	categoryName,
 	categoryIcon,
-	imageFilename,
+	imageFilename: _imageFilename,
 	imageUrl,
 	productUrl,
 	threadId,

src/client/components/ImageUpload.tsx

@@ -10,7 +10,11 @@ interface ImageUploadProps {
 const MAX_SIZE_BYTES = 5 * 1024 * 1024; // 5MB
 const ACCEPTED_TYPES = ["image/jpeg", "image/png", "image/webp"];
 
-export function ImageUpload({ value, imageUrl, onChange }: ImageUploadProps) {
+export function ImageUpload({
+	value: _value,
+	imageUrl,
+	onChange,
+}: ImageUploadProps) {
 	const [uploading, setUploading] = useState(false);
 	const [error, setError] = useState<string | null>(null);
 	const [localPreview, setLocalPreview] = useState<string | null>(null);

src/client/components/ItemCard.tsx

@@ -16,6 +16,7 @@ interface ItemCardProps {
 	imageFilename: string | null;
 	imageUrl?: string | null;
 	productUrl?: string | null;
+	brand?: string | null;
 	onRemove?: () => void;
 	classification?: string;
 	onClassificationCycle?: () => void;
@@ -29,9 +30,10 @@ export function ItemCard({
 	quantity,
 	categoryName,
 	categoryIcon,
-	imageFilename,
+	imageFilename: _imageFilename,
 	imageUrl,
 	productUrl,
+	brand,
 	onRemove,
 	classification,
 	onClassificationCycle,
@@ -177,9 +179,14 @@ export function ItemCard({
 				)}
 			</div>
 			<div className="p-4">
+				{brand && (
+					<p className="text-xs font-medium text-gray-400 uppercase tracking-wide mb-0.5">
+						{brand}
+					</p>
+				)}
 				<div className="flex items-center gap-1.5 mb-2">
 					<h3 className="text-sm font-semibold text-gray-900 truncate min-w-0">
-						{name}
+						{brand ? name.replace(`${brand} `, "") : name}
 					</h3>
 					{quantity != null && quantity > 1 && (
 						<span className="shrink-0 inline-flex items-center px-1.5 py-0.5 rounded-full text-xs font-medium bg-gray-100 text-gray-600">