feat(05-02): add always-visible 4:3 image area with placeholders to ItemCard and CandidateCard

- Replace conditional image rendering with always-present 4:3 aspect ratio area
- Show category emoji centered on gray background when no image exists
- Ensures consistent card heights across grid layouts

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

src/client/components/CandidateCard.tsx

@@ -1,4 +1,4 @@
-import { formatWeight, formatPrice } from "../lib/formatters";
+import { formatPrice, formatWeight } from "../lib/formatters";
 import { useUIStore } from "../stores/uiStore";
 
 interface CandidateCardProps {
@@ -32,15 +32,19 @@ export function CandidateCard({
 
 	return (
 		<div className="bg-white rounded-xl border border-gray-100 hover:border-gray-200 hover:shadow-sm transition-all overflow-hidden">
-      {imageFilename && (
 			<div className="aspect-[4/3] bg-gray-50">
+				{imageFilename ? (
 					<img
 						src={`/uploads/${imageFilename}`}
 						alt={name}
 						className="w-full h-full object-cover"
 					/>
+				) : (
+					<div className="w-full h-full flex flex-col items-center justify-center">
+						<span className="text-3xl">{categoryEmoji}</span>
 					</div>
 				)}
+			</div>
 			<div className="p-4">
 				<h3 className="text-sm font-semibold text-gray-900 mb-2 truncate">
 					{name}

src/client/components/ItemCard.tsx

@@ -1,4 +1,4 @@
-import { formatWeight, formatPrice } from "../lib/formatters";
+import { formatPrice, formatWeight } from "../lib/formatters";
 import { useUIStore } from "../stores/uiStore";
 
 interface ItemCardProps {
@@ -47,20 +47,34 @@ export function ItemCard({
 					className="absolute top-2 right-2 z-10 w-6 h-6 flex items-center justify-center rounded-full bg-gray-100/80 text-gray-400 hover:bg-red-100 hover:text-red-500 opacity-0 group-hover:opacity-100 transition-all cursor-pointer"
 					title="Remove from setup"
 				>
-          <svg className="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
-            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
+					<svg
+						className="w-3.5 h-3.5"
+						fill="none"
+						stroke="currentColor"
+						viewBox="0 0 24 24"
+					>
+						<path
+							strokeLinecap="round"
+							strokeLinejoin="round"
+							strokeWidth={2}
+							d="M6 18L18 6M6 6l12 12"
+						/>
 					</svg>
 				</span>
 			)}
-      {imageFilename && (
 			<div className="aspect-[4/3] bg-gray-50">
+				{imageFilename ? (
 					<img
 						src={`/uploads/${imageFilename}`}
 						alt={name}
 						className="w-full h-full object-cover"
 					/>
+				) : (
+					<div className="w-full h-full flex flex-col items-center justify-center">
+						<span className="text-3xl">{categoryEmoji}</span>
 					</div>
 				)}
+			</div>
 			<div className="p-4">
 				<h3 className="text-sm font-semibold text-gray-900 mb-2 truncate">
 					{name}