feat(berths): link prospect on status change + reason chips from vocabulary

When status moves to under_offer or sold, the dialog now surfaces an
interest selector below the reason textarea. Picking an interest
passes interestId on the PATCH, which the service uses to call
setPrimaryBerth — auto-creates a primary interest_berths row if not
present, demoting any prior primary in the same transaction so the
unique partial index never fires. Cross-port leakage is blocked inside
the existing interest-berths helper.

Reasons are now offered as quick-pick chips above the textarea,
sourced from the new berth_status_change_reasons vocabulary
(Wave 5). Clicking a chip fills the textarea so reps stay on the
keyboard.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/lib/services/berths.service.ts

@@ -299,6 +299,14 @@ export async function updateBerthStatus(
     }),
   );
 
+  // Optional: link the chosen interest as the primary holder of this
+  // berth. Cross-port checks live inside the helper so a malicious
+  // interestId from another port can't slip past the status PATCH.
+  if (data.interestId) {
+    const { setPrimaryBerth } = await import('@/lib/services/interest-berths.service');
+    await setPrimaryBerth(data.interestId, id);
+  }
+
   return updated!;
 }