fix(ux): T4 polish wave — empty-contact filter, redirect-on-create, friendly stage errors

F19: client form drops empty-value contacts on submit; auto-promotes first remaining row to primary if none flagged.
F20: new-interest dialog redirects to the detail page on create instead of bouncing back to the list.
F21: stage-transition validation errors render with STAGE_LABELS — "Yacht is required before leaving the Enquiry stage." (was "yachtId is required before leaving stage=enquiry").
F22: blocked-stage marker swapped from the ⚑ unicode glyph to a Lucide AlertTriangle with aria-label.
F25: documents-hub folder selection moves to ?folder=<id> querystring so deep-link / browser-back / refresh round-trip the current folder.
F26: reopen-outcome action now toasts "Outcome cleared — interest is open again."
F27: stage PATCH where target === current short-circuits to a no-op return; downstream callers don't see a phantom stage_change audit row.

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

src/components/interests/interest-detail-header.tsx

@@ -2,6 +2,7 @@
 
 import { useState } from 'react';
 import { useMutation, useQueryClient } from '@tanstack/react-query';
+import { toast } from 'sonner';
 import {
   Pencil,
   Archive,
@@ -144,6 +145,9 @@ export function InterestDetailHeader({ portSlug, interest }: InterestDetailHeade
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ['interests', interest.id] });
       queryClient.invalidateQueries({ queryKey: ['interests'] });
+      // F26: confirm to the user that the action ran — pre-fix the
+      // button gave no feedback and reps weren't sure if it took.
+      toast.success('Outcome cleared — interest is open again.');
     },
   });