feat(10-01): wire pros/cons through client hooks, form, and card indicator

- CandidateResponse: add pros/cons string|null fields
- CandidateForm: add pros/cons to FormData, INITIAL_FORM, pre-fill, payload
- CandidateForm: add Pros/Cons textarea inputs (after Notes, before Product Link)
- CandidateCard: add pros/cons props, render purple +/- Notes badge when present
- Thread detail route: pass pros/cons props to CandidateCard

src/client/components/CandidateCard.tsx

@@ -18,6 +18,8 @@ interface CandidateCardProps {
 	isActive: boolean;
 	status: "researching" | "ordered" | "arrived";
 	onStatusChange: (status: "researching" | "ordered" | "arrived") => void;
+	pros?: string | null;
+	cons?: string | null;
 }
 
 export function CandidateCard({
@@ -33,6 +35,8 @@ export function CandidateCard({
 	isActive,
 	status,
 	onStatusChange,
+	pros,
+	cons,
 }: CandidateCardProps) {
 	const unit = useWeightUnit();
 	const currency = useCurrency();
@@ -174,6 +178,11 @@ export function CandidateCard({
 						{categoryName}
 					</span>
 					<StatusBadge status={status} onStatusChange={onStatusChange} />
+					{(pros || cons) && (
+						<span className="inline-flex items-center px-2 py-0.5 rounded-full text-xs font-medium bg-purple-50 text-purple-700">
+							+/- Notes
+						</span>
+					)}
 				</div>
 			</div>
 		</button>

src/client/components/CandidateForm.tsx

@@ -19,6 +19,8 @@ interface FormData {
 	notes: string;
 	productUrl: string;
 	imageFilename: string | null;
+	pros: string;
+	cons: string;
 }
 
 const INITIAL_FORM: FormData = {
@@ -29,6 +31,8 @@ const INITIAL_FORM: FormData = {
 	notes: "",
 	productUrl: "",
 	imageFilename: null,
+	pros: "",
+	cons: "",
 };
 
 export function CandidateForm({
@@ -61,6 +65,8 @@ export function CandidateForm({
 					notes: candidate.notes ?? "",
 					productUrl: candidate.productUrl ?? "",
 					imageFilename: candidate.imageFilename,
+					pros: candidate.pros ?? "",
+					cons: candidate.cons ?? "",
 				});
 			}
 		} else if (mode === "add") {
@@ -110,6 +116,8 @@ export function CandidateForm({
 			notes: form.notes.trim() || undefined,
 			productUrl: form.productUrl.trim() || undefined,
 			imageFilename: form.imageFilename ?? undefined,
+			pros: form.pros.trim() || undefined,
+			cons: form.cons.trim() || undefined,
 		};
 
 		if (mode === "add") {
@@ -239,6 +247,42 @@ export function CandidateForm({
 				/>
 			</div>
 
+			{/* Pros */}
+			<div>
+				<label
+					htmlFor="candidate-pros"
+					className="block text-sm font-medium text-gray-700 mb-1"
+				>
+					Pros
+				</label>
+				<textarea
+					id="candidate-pros"
+					value={form.pros}
+					onChange={(e) => setForm((f) => ({ ...f, pros: e.target.value }))}
+					rows={3}
+					className="w-full px-3 py-2 border border-gray-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-gray-400 focus:border-transparent resize-none"
+					placeholder="One pro per line..."
+				/>
+			</div>
+
+			{/* Cons */}
+			<div>
+				<label
+					htmlFor="candidate-cons"
+					className="block text-sm font-medium text-gray-700 mb-1"
+				>
+					Cons
+				</label>
+				<textarea
+					id="candidate-cons"
+					value={form.cons}
+					onChange={(e) => setForm((f) => ({ ...f, cons: e.target.value }))}
+					rows={3}
+					className="w-full px-3 py-2 border border-gray-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-gray-400 focus:border-transparent resize-none"
+					placeholder="One con per line..."
+				/>
+			</div>
+
 			{/* Product Link */}
 			<div>
 				<label