feat(11-02): add useReorderCandidates hook, candidateViewMode, and CandidateListItem component

- Add useReorderCandidates mutation hook with apiPatch to /candidates/reorder endpoint
- Add candidateViewMode (list|grid) state and setCandidateViewMode to uiStore
- Create CandidateListItem component with drag handle, rank badge, horizontal layout
- Export RankBadge helper (gold/silver/bronze medal icons for top 3)
- Add style prop support to LucideIcon component
- Add pros/cons fields to CandidateWithCategory in useThreads.ts

src/client/hooks/useThreads.ts

@@ -27,6 +27,8 @@ interface CandidateWithCategory {
 	productUrl: string | null;
 	imageFilename: string | null;
 	status: "researching" | "ordered" | "arrived";
+	pros: string | null;
+	cons: string | null;
 	createdAt: string;
 	updatedAt: string;
 	categoryName: string;