feat(expenses+interests): trip/event grouping (lightweight)

Per the trips/events design discussion: instead of building a full
events domain (table + CRUD UI + calendar) for the 6–12 yacht shows
a year, ship the cheap version that covers the actual asks.

Expenses — `tripLabel` free-text:
- New `expenses.trip_label` text column (migration 0039) + index for
  filter / autocomplete lookup.
- Validator: createExpenseShape + listExpensesSchema +
  exportExpensePdfSchema.filter all accept tripLabel.
- Service: createExpense + updateExpense persist; listExpenses filters;
  new `listTripLabels(portId, search?)` returns distinct values
  ordered by most-recent expenseDate so the autocomplete surfaces
  recently-used labels first.
- New `GET /api/v1/expenses/trip-labels` endpoint (gated by
  expenses.view) backs the autocomplete.
- Form dialog: native `<datalist>` powered by the autocomplete query
  so reps don't end up with "Palm Beach 2026" / "palm-beach 2026"
  fragmented across two PDF sections.
- Expense list: new "Trip" column (badge) + free-text filter.
- Detail page: trip label rendered alongside Category / Payer.
- PDF export: GroupBy gains 'trip'; filter.tripLabel narrows the
  export. Untagged rows fall under "(no trip)".
- Trim/normalize on write so " Palm Beach 2026 " === "Palm Beach 2026".

Interests — event tagging via existing tag system:
- Reps can tag interests with an event tag (e.g. "Palm Beach 2026")
  via the existing InlineTagEditor on the detail page; tags are
  port-scoped and reusable.
- Interest list now has a TagPicker filter rendered next to the
  FilterBar so reps can sort prospects by event attended ("show me
  every lead from Palm Beach"). Hidden 'relation'-typed
  FilterDefinition for tagIds wires URL round-trip + saved-views
  capture without rendering inside the FilterBar.
- FilterBar deserializer now handles `relation` types as comma-joined
  arrays on URL load.

Why a free-text trip label and not a trips table:
- 6–12 events/year doesn't justify a domain. The CRUD UI cost would
  be most of the engineering, and reps already have the events on
  their personal calendars.
- If usage proves demand for per-event ROI dashboards or richer
  attribution, promote to a real `trips` table later. Migration
  path: trip_label → tripId is a backfill+swap.

Test status: 1168/1168 vitest. tsc clean. Migration 0039 applied
in dev (also caught + fixed an unrelated audit-v3 follow-up: 0037
had `idx_br_interest` colliding with the existing
`berth_recommendations.idx_br_interest`; renamed to
`idx_brr_interest` / `idx_brr_contract_file`).

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

src/components/expenses/expense-form-dialog.tsx

@@ -3,7 +3,7 @@
 import { useEffect, useRef, useState } from 'react';
 import { useForm } from 'react-hook-form';
 import { zodResolver } from '@hookform/resolvers/zod';
-import { useMutation, useQueryClient } from '@tanstack/react-query';
+import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
 import { AlertTriangle, Loader2, Upload, X } from 'lucide-react';
 
 import { Button } from '@/components/ui/button';
@@ -59,6 +59,16 @@ export function ExpenseFormDialog({ open, onOpenChange, expense }: ExpenseFormDi
     },
   });
 
+  // Distinct trip labels for the port — fed into the datalist so the
+  // form input doubles as an autocomplete. Cached for the dialog's life
+  // since the list rarely changes mid-session.
+  const tripLabelsQuery = useQuery<{ data: string[] }>({
+    queryKey: ['expenses', 'trip-labels'],
+    queryFn: () => apiFetch('/api/v1/expenses/trip-labels'),
+    enabled: open,
+    staleTime: 60_000,
+  });
+
   useEffect(() => {
     if (open && expense) {
       reset({
@@ -70,6 +80,7 @@ export function ExpenseFormDialog({ open, onOpenChange, expense }: ExpenseFormDi
         payer: expense.payer ?? undefined,
         expenseDate: new Date(expense.expenseDate),
         paymentStatus: (expense.paymentStatus as CreateExpenseInput['paymentStatus']) ?? 'unpaid',
+        tripLabel: expense.tripLabel ?? undefined,
       });
       setUploadedReceipt(null);
       setPreviewUrl(null);
@@ -295,6 +306,30 @@ export function ExpenseFormDialog({ open, onOpenChange, expense }: ExpenseFormDi
             </Select>
           </div>
 
+          <div className="space-y-2">
+            <Label htmlFor="tripLabel">Trip / event</Label>
+            <Input
+              id="tripLabel"
+              placeholder="e.g. Palm Beach 2026 (optional)"
+              maxLength={120}
+              list="expense-trip-label-suggestions"
+              autoComplete="off"
+              {...register('tripLabel')}
+            />
+            {/* Native datalist gives the rep prior trip values as
+             *  autocomplete suggestions — keeps spellings consistent
+             *  ("Palm Beach 2026" vs "palm-beach 2026") so the PDF
+             *  group-by-trip section actually merges them. */}
+            <datalist id="expense-trip-label-suggestions">
+              {(tripLabelsQuery.data?.data ?? []).map((label) => (
+                <option key={label} value={label} />
+              ))}
+            </datalist>
+            <p className="text-xs text-muted-foreground">
+              Group expenses by yacht show or business trip. Leave empty for everyday spend.
+            </p>
+          </div>
+
           <div className="space-y-2">
             <Label htmlFor="description">Description</Label>
             <Textarea