feat(29-03): create ImageCropEditor component

Zoom+pan editor using react-easy-crop with zoom slider, save/cancel
buttons, and dominant color background. Returns crop coordinates
for persistence.

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

src/client/components/ImageCropEditor.tsx

@@ -0,0 +1,135 @@
+import { useCallback, useState } from "react";
+import Cropper from "react-easy-crop";
+import type { Area, Point } from "react-easy-crop";
+
+interface CropResult {
+	zoom: number;
+	x: number;
+	y: number;
+}
+
+interface ImageCropEditorProps {
+	imageUrl: string;
+	dominantColor?: string | null;
+	initialZoom?: number;
+	initialX?: number;
+	initialY?: number;
+	aspect?: number;
+	onSave: (result: CropResult) => void;
+	onCancel: () => void;
+}
+
+export function ImageCropEditor({
+	imageUrl,
+	dominantColor,
+	initialZoom = 1,
+	initialX = 0,
+	initialY = 0,
+	aspect = 4 / 3,
+	onSave,
+	onCancel,
+}: ImageCropEditorProps) {
+	const [crop, setCrop] = useState<Point>({ x: initialX, y: initialY });
+	const [zoom, setZoom] = useState(initialZoom);
+
+	const onCropComplete = useCallback(
+		(_croppedArea: Area, _croppedAreaPixels: Area) => {
+			// Crop/zoom state is tracked via setCrop/setZoom, not this callback
+		},
+		[],
+	);
+
+	function handleSave() {
+		onSave({
+			zoom,
+			x: crop.x,
+			y: crop.y,
+		});
+	}
+
+	return (
+		<div className="flex flex-col gap-4">
+			{/* Crop area */}
+			<div
+				className="relative w-full overflow-hidden rounded-xl"
+				style={{ aspectRatio: `${aspect}` }}
+			>
+				<Cropper
+					image={imageUrl}
+					crop={crop}
+					zoom={zoom}
+					aspect={aspect}
+					onCropChange={setCrop}
+					onZoomChange={setZoom}
+					onCropComplete={onCropComplete}
+					minZoom={1}
+					maxZoom={3}
+					style={{
+						containerStyle: {
+							backgroundColor: dominantColor || "#f3f4f6",
+							borderRadius: "0.75rem",
+						},
+					}}
+					objectFit="contain"
+				/>
+			</div>
+
+			{/* Zoom slider */}
+			<div className="flex items-center gap-3 px-1">
+				<label htmlFor="crop-zoom" className="sr-only">
+					Zoom
+				</label>
+				<svg
+					className="w-4 h-4 text-gray-400 shrink-0"
+					fill="none"
+					stroke="currentColor"
+					viewBox="0 0 24 24"
+					strokeWidth={1.5}
+				>
+					<circle cx="11" cy="11" r="8" />
+					<path d="m21 21-4.3-4.3" />
+					<path d="M8 11h6" />
+				</svg>
+				<input
+					id="crop-zoom"
+					type="range"
+					min={1}
+					max={3}
+					step={0.01}
+					value={zoom}
+					onChange={(e) => setZoom(Number(e.target.value))}
+					className="flex-1 h-1.5 bg-gray-200 rounded-full appearance-none cursor-pointer accent-gray-900"
+				/>
+				<svg
+					className="w-4 h-4 text-gray-400 shrink-0"
+					fill="none"
+					stroke="currentColor"
+					viewBox="0 0 24 24"
+					strokeWidth={1.5}
+				>
+					<circle cx="11" cy="11" r="8" />
+					<path d="m21 21-4.3-4.3" />
+					<path d="M8 11h6M11 8v6" />
+				</svg>
+			</div>
+
+			{/* Action buttons */}
+			<div className="flex justify-between">
+				<button
+					type="button"
+					onClick={onCancel}
+					className="px-4 py-2 text-sm font-medium text-gray-600 hover:text-gray-900 transition-colors"
+				>
+					Cancel
+				</button>
+				<button
+					type="button"
+					onClick={handleSave}
+					className="px-4 py-2 text-sm font-semibold text-white bg-gray-900 hover:bg-gray-800 rounded-lg transition-colors"
+				>
+					Save framing
+				</button>
+			</div>
+		</div>
+	);
+}