feat(08-01): create StatusBadge component and wire into CandidateCard

- StatusBadge: clickable pill badge with popup menu (researching/ordered/arrived)
- Muted gray styling, LucideIcon per status, click-outside dismiss, Escape key support
- CandidateCard: status + onStatusChange props, StatusBadge in pill row after category
- Thread detail page: passes candidate.status and useUpdateCandidate for onStatusChange
- Fix Biome formatting for candidateStatusSchema enum

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/shared/schemas.ts

@@ -37,7 +37,11 @@ export const updateThreadSchema = z.object({
 });
 
 // Candidate status
-export const candidateStatusSchema = z.enum(["researching", "ordered", "arrived"]);
+export const candidateStatusSchema = z.enum([
+	"researching",
+	"ordered",
+	"arrived",
+]);
 
 // Candidate schemas (same fields as items)
 export const createCandidateSchema = z.object({