feat(29-02): update CandidateCard and CandidateListItem to use GearImage

Replace object-cover with GearImage for fit-within rendering on
candidate cards and list items.

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

src/client/components/CandidateCard.tsx

@@ -4,6 +4,7 @@ import type { CandidateDelta } from "../hooks/useImpactDeltas";
 import { LucideIcon } from "../lib/iconData";
 import { useUIStore } from "../stores/uiStore";
 import { RankBadge } from "./CandidateListItem";
+import { GearImage, imageContainerBg } from "./GearImage";
 import { ImpactDeltaBadge } from "./ImpactDeltaBadge";
 import { StatusBadge } from "./StatusBadge";
 
@@ -17,6 +18,10 @@ interface CandidateCardProps {
 	imageFilename: string | null;
 	imageUrl?: string | null;
 	productUrl?: string | null;
+	dominantColor?: string | null;
+	cropZoom?: number | null;
+	cropX?: number | null;
+	cropY?: number | null;
 	threadId: number;
 	isActive: boolean;
 	status: "researching" | "ordered" | "arrived";
@@ -37,6 +42,10 @@ export function CandidateCard({
 	imageFilename: _imageFilename,
 	imageUrl,
 	productUrl,
+	dominantColor,
+	cropZoom,
+	cropX,
+	cropY,
 	threadId,
 	isActive,
 	status,
@@ -149,15 +158,25 @@ export function CandidateCard({
 					</svg>
 				</span>
 			)}
-			<div className="aspect-[4/3] bg-gray-50">
+			<div
+				className="aspect-[4/3] overflow-hidden"
+				style={{
+					backgroundColor: imageUrl
+						? imageContainerBg(dominantColor)
+						: undefined,
+				}}
+			>
 				{imageUrl ? (
-					<img
+					<GearImage
 						src={imageUrl}
 						alt={name}
-						className="w-full h-full object-cover"
+						dominantColor={dominantColor}
+						cropZoom={cropZoom}
+						cropX={cropX}
+						cropY={cropY}
 					/>
 				) : (
-					<div className="w-full h-full flex flex-col items-center justify-center">
+					<div className="w-full h-full bg-gray-50 flex flex-col items-center justify-center">
 						<LucideIcon
 							name={categoryIcon}
 							size={36}

src/client/components/CandidateListItem.tsx

@@ -5,6 +5,7 @@ import { useFormatters } from "../hooks/useFormatters";
 import type { CandidateDelta } from "../hooks/useImpactDeltas";
 import { LucideIcon } from "../lib/iconData";
 import { useUIStore } from "../stores/uiStore";
+import { GearImage, imageContainerBg } from "./GearImage";
 import { ImpactDeltaBadge } from "./ImpactDeltaBadge";
 import { StatusBadge } from "./StatusBadge";
 
@@ -19,6 +20,7 @@ interface CandidateWithCategory {
 	productUrl: string | null;
 	imageFilename: string | null;
 	imageUrl?: string | null;
+	dominantColor?: string | null;
 	status: "researching" | "ordered" | "arrived";
 	pros: string | null;
 	cons: string | null;
@@ -84,12 +86,18 @@ export function CandidateListItem({
 			<RankBadge rank={rank} />
 
 			{/* Image thumbnail */}
-			<div className="w-12 h-12 rounded-lg overflow-hidden shrink-0 bg-gray-50 flex items-center justify-center">
+			<div
+				className="w-12 h-12 rounded-lg overflow-hidden shrink-0 flex items-center justify-center"
+				style={{
+					backgroundColor: candidate.imageUrl
+						? imageContainerBg(candidate.dominantColor)
+						: undefined,
+				}}
+			>
 				{candidate.imageUrl ? (
-					<img
+					<GearImage
 						src={candidate.imageUrl}
 						alt={candidate.name}
-						className="w-full h-full object-cover"
 					/>
 				) : (
 					<LucideIcon