feat(21-03): rewire card click handlers to navigate to detail pages

- ItemCard navigates to /items/$itemId instead of opening edit panel
- CandidateCard navigates to /threads/$threadId/candidates/$candidateId
- CandidateListItem navigates to candidate detail page
- CatalogSearchOverlay cards navigate to /global-items/$globalItemId
- Add button on catalog cards uses stopPropagation to prevent navigation

src/client/components/CandidateCard.tsx

@@ -1,3 +1,4 @@
+import { useNavigate } from "@tanstack/react-router";
 import { useFormatters } from "../hooks/useFormatters";
 import type { CandidateDelta } from "../hooks/useImpactDeltas";
 import { LucideIcon } from "../lib/iconData";
@@ -46,7 +47,7 @@ export function CandidateCard({
 	delta,
 }: CandidateCardProps) {
 	const { weight, price } = useFormatters();
-	const openCandidateEditPanel = useUIStore((s) => s.openCandidateEditPanel);
+	const navigate = useNavigate();
 	const openConfirmDeleteCandidate = useUIStore(
 		(s) => s.openConfirmDeleteCandidate,
 	);
@@ -56,7 +57,12 @@ export function CandidateCard({
 	return (
 		<button
 			type="button"
-			onClick={() => openCandidateEditPanel(id)}
+			onClick={() =>
+				navigate({
+					to: "/threads/$threadId/candidates/$candidateId",
+					params: { threadId: String(threadId), candidateId: String(id) },
+				})
+			}
 			className="relative w-full text-left bg-white rounded-xl border border-gray-100 hover:border-gray-200 hover:shadow-sm transition-all overflow-hidden group"
 		>
 			{/* Hover-reveal action buttons */}