feat(forms): migrate remaining native date inputs to <DatePicker> / <DateTimePicker>

Sweeps the last ~17 native `<Input type="date"|"datetime-local">`
call sites onto the shared `<DatePicker>` / `<DateTimePicker>`
primitives so date entry is uniform across the app (calendar popover
on desktop, native OS picker on mobile via the primitive's
viewport-aware fallback).

Three patterns handled:

  1. Controlled value/onChange — direct swap to <DatePicker
     value/onChange>:
       audit-log-list.tsx (audit-from / audit-to filters)
       reports/generate-report-form.tsx (date range)
       scan/scan-shell.tsx (expense date)
       reservations/reservation-detail.tsx (end-reservation dialog)
       shared/filter-bar.tsx ('date' filter variant)

  2. RHF `register('field')` pattern — wrapped in <Controller> with
     field.value/field.onChange bridge. The picker's '' → undefined
     normalisation kicks in via `field.onChange(v || undefined)`:
       berths/berth-form.tsx (tenureStartDate + tenureEndDate)
       reservations/berth-reserve-dialog.tsx (startDate)
       companies/add-membership-dialog.tsx (startDate)
       yachts/yacht-transfer-dialog.tsx (effectiveDate)
       invoices/invoice-detail.tsx (paymentDate)

  3. RHF + Date-typed schema — same Controller wrap, plus a
     Date<->YYYY-MM-DD bridge in the render() since the zod schema
     coerces these to Date:
       expenses/expense-form-dialog.tsx (expenseDate)
       companies/company-form.tsx (incorporationDate)

  4. Datetime variants — swapped onto <DateTimePicker>:
       interests/interest-contact-log-tab.tsx (occurredAt + followUpAt)

Skipped because they ARE picker primitives or internal date variants:
  - ui/date-picker.tsx, ui/date-time-picker.tsx (the primitives)
  - shared/inline-editable-field.tsx (the InlineEditableField date variant)
  - dashboard/date-range-picker.tsx (its own popover with min/max gating
    that doesn't map cleanly onto the shared primitive)

Removed now-unused Input imports from four files.

Verified: tsc clean, vitest 1448/1448.

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

src/components/companies/add-membership-dialog.tsx

@@ -1,7 +1,7 @@
 'use client';
 
 import { useEffect, useState } from 'react';
-import { useForm } from 'react-hook-form';
+import { useForm, Controller } from 'react-hook-form';
 import { useMutation, useQueryClient } from '@tanstack/react-query';
 import { Loader2 } from 'lucide-react';
 
@@ -17,6 +17,7 @@ import { Button } from '@/components/ui/button';
 import { Checkbox } from '@/components/ui/checkbox';
 import { Input } from '@/components/ui/input';
 import { Label } from '@/components/ui/label';
+import { DatePicker } from '@/components/ui/date-picker';
 import {
   Select,
   SelectContent,
@@ -69,6 +70,7 @@ export function AddMembershipDialog({ open, onOpenChange, companyId }: AddMember
     watch,
     setValue,
     reset,
+    control,
     formState: { errors, isSubmitting },
   } = useForm<FormValues>({
     defaultValues: {
@@ -180,7 +182,14 @@ export function AddMembershipDialog({ open, onOpenChange, companyId }: AddMember
 
           <div className="space-y-2">
             <Label htmlFor="startDate">Start date</Label>
-            <Input id="startDate" type="date" {...register('startDate', { required: true })} />
+            <Controller
+              control={control}
+              name="startDate"
+              rules={{ required: true }}
+              render={({ field }) => (
+                <DatePicker id="startDate" value={field.value ?? ''} onChange={field.onChange} />
+              )}
+            />
             {errors.startDate && <p className="text-xs text-destructive">Required</p>}
           </div>