fix(portal): review display, hover overlay, and drag ghost for complex field types

- Extract formatFieldValue helper for shared use between review step
  and confirmation page — one source of truth for TAG_PICKER,
  AVAILABILITY_PICKER, and SECTION_PRIORITY display, so the raw-ID
  and [object Object] leaks from two parallel stringifiers can't
  regress on either side.
- TAG_PICKER: lookup via field.available_tags (server-inlined).
- AVAILABILITY_PICKER: lookup via usePublicFormTimeSlots, strip
  seconds. "Laden…" while the cache warms.
- SECTION_PRIORITY: defensive shape-guard prevents [object Object]
  leaks, sorted priority-prefixed rendering ("1. Bar, 2. Hospitality").
- Subtle primary-tinted hover (4% primary, primary border) replacing
  the near-black Vuetify default overlay on unranked section cards.
- Explicit ghost-class / drag-class / chosen-class on vuedraggable
  with solid drag-clone + elevation shadow and a 30%-opacity silhouette
  at the origin, so mid-drag text no longer overlaps.
- 17 new formatFieldValue unit assertions + 2 new FieldSectionPriority
  assertions locking in the draggable classes and the disabled-card
  toggle at max.

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

apps/portal/tests/unit/formatFieldValue.spec.ts

@@ -0,0 +1,188 @@
+import { describe, expect, it } from 'vitest'
+import { formatFieldValue } from '@/composables/formatFieldValue'
+import { FormFieldType } from '@/types/formBuilder'
+import type {
+  AvailableTag,
+  PublicFormField,
+  PublicFormSectionOption,
+  PublicFormTimeSlot,
+} from '@/types/formBuilder'
+
+function field(partial: Partial<PublicFormField> = {}): PublicFormField {
+  return {
+    id: partial.id ?? 'f',
+    slug: partial.slug ?? 'slug',
+    field_type: partial.field_type ?? FormFieldType.TEXT,
+    label: partial.label ?? 'Label',
+    help_text: partial.help_text ?? null,
+    options: partial.options ?? null,
+    available_tags: partial.available_tags ?? null,
+    validation_rules: partial.validation_rules ?? null,
+    is_required: partial.is_required ?? false,
+    display_width: partial.display_width ?? 'full',
+    conditional_logic: partial.conditional_logic ?? null,
+    sort_order: partial.sort_order ?? 0,
+    form_schema_section_id: partial.form_schema_section_id ?? null,
+  }
+}
+
+function tag(partial: Partial<AvailableTag>): AvailableTag {
+  return { id: partial.id ?? 't_1', name: partial.name ?? 'Tag', category: partial.category ?? '' }
+}
+
+function timeSlot(partial: Partial<PublicFormTimeSlot>): PublicFormTimeSlot {
+  return {
+    id: partial.id ?? 'ts_1',
+    name: partial.name ?? 'Vrijdag avond',
+    date: partial.date ?? '2026-07-10',
+    start_time: partial.start_time ?? '18:00:00',
+    end_time: partial.end_time ?? '23:00:00',
+    duration_hours: partial.duration_hours ?? 5,
+    event_id: partial.event_id ?? 'evt_1',
+    event_name: partial.event_name ?? 'Event',
+  }
+}
+
+function section(partial: Partial<PublicFormSectionOption>): PublicFormSectionOption {
+  return {
+    id: partial.id ?? 's_1',
+    name: partial.name ?? 'Section',
+    category: partial.category ?? null,
+    icon: partial.icon ?? null,
+    registration_description: partial.registration_description ?? null,
+  }
+}
+
+describe('formatFieldValue', () => {
+  describe('empty values', () => {
+    it.each<[unknown]>([
+      [null],
+      [undefined],
+      [''],
+      [[]],
+    ])('returns "—" for empty value %s on any field type', v => {
+      expect(formatFieldValue(field({ field_type: FormFieldType.TEXT }), v, [], [])).toBe('—')
+    })
+  })
+
+  describe('TAG_PICKER', () => {
+    it('maps IDs to tag names using field.available_tags', () => {
+      const f = field({
+        field_type: FormFieldType.TAG_PICKER,
+        available_tags: [tag({ id: 'a', name: 'Tapper' }), tag({ id: 'b', name: 'Barista' })],
+      })
+
+      expect(formatFieldValue(f, ['a', 'b'], undefined, undefined)).toBe('Tapper, Barista')
+    })
+
+    it('labels unknown tag IDs as "(onbekende tag)"', () => {
+      const f = field({
+        field_type: FormFieldType.TAG_PICKER,
+        available_tags: [tag({ id: 'a', name: 'Tapper' })],
+      })
+
+      expect(formatFieldValue(f, ['a', 'zzz'], undefined, undefined)).toBe('Tapper, (onbekende tag)')
+    })
+  })
+
+  describe('AVAILABILITY_PICKER', () => {
+    it('maps IDs to "name (start–end)" with seconds stripped', () => {
+      const f = field({ field_type: FormFieldType.AVAILABILITY_PICKER })
+      const slots = [timeSlot({ id: 'x', name: 'Vrijwilligers afbraak zondag', start_time: '10:00:00', end_time: '16:00:00' })]
+
+      expect(formatFieldValue(f, ['x'], slots, undefined))
+        .toBe('Vrijwilligers afbraak zondag (10:00–16:00)')
+    })
+
+    it('labels unknown time_slot IDs as "(onbekend tijdslot)"', () => {
+      const f = field({ field_type: FormFieldType.AVAILABILITY_PICKER })
+      const slots = [timeSlot({ id: 'x' })]
+
+      expect(formatFieldValue(f, ['x', 'y'], slots, undefined))
+        .toBe('Vrijdag avond (18:00–23:00), (onbekend tijdslot)')
+    })
+
+    it('returns "Laden…" while the time-slots query is still fetching', () => {
+      const f = field({ field_type: FormFieldType.AVAILABILITY_PICKER })
+
+      expect(formatFieldValue(f, ['x'], undefined, undefined)).toBe('Laden…')
+    })
+  })
+
+  describe('SECTION_PRIORITY', () => {
+    it('renders "N. Name, …" sorted by priority', () => {
+      const f = field({ field_type: FormFieldType.SECTION_PRIORITY })
+      const sections = [
+        section({ id: 's_1', name: 'Hoofdpodium Bar' }),
+        section({ id: 's_2', name: 'Theatertent Bar' }),
+      ]
+
+      expect(formatFieldValue(
+        f,
+        [{ section_id: 's_1', priority: 1 }, { section_id: 's_2', priority: 2 }],
+        undefined,
+        sections,
+      )).toBe('1. Hoofdpodium Bar, 2. Theatertent Bar')
+    })
+
+    it('re-sorts unordered input by priority before rendering', () => {
+      const f = field({ field_type: FormFieldType.SECTION_PRIORITY })
+      const sections = [section({ id: 's_1', name: 'A' }), section({ id: 's_2', name: 'B' })]
+
+      expect(formatFieldValue(
+        f,
+        [{ section_id: 's_2', priority: 2 }, { section_id: 's_1', priority: 1 }],
+        undefined,
+        sections,
+      )).toBe('1. A, 2. B')
+    })
+
+    it('labels unknown section IDs as "(onbekende sectie)"', () => {
+      const f = field({ field_type: FormFieldType.SECTION_PRIORITY })
+      const sections = [section({ id: 's_1', name: 'Known' })]
+
+      expect(formatFieldValue(
+        f,
+        [{ section_id: 's_1', priority: 1 }, { section_id: 'missing', priority: 2 }],
+        undefined,
+        sections,
+      )).toBe('1. Known, 2. (onbekende sectie)')
+    })
+
+    it('returns "—" when the value shape is malformed (defensive guard)', () => {
+      const f = field({ field_type: FormFieldType.SECTION_PRIORITY })
+
+      // Flat string[] — wrong shape, must not leak [object Object].
+      expect(formatFieldValue(f, ['s_1', 's_2'], undefined, [section({ id: 's_1', name: 'Known' })])).toBe('—')
+    })
+
+    it('returns "Laden…" while the sections query is still fetching', () => {
+      const f = field({ field_type: FormFieldType.SECTION_PRIORITY })
+
+      expect(formatFieldValue(
+        f,
+        [{ section_id: 's_1', priority: 1 }],
+        undefined,
+        undefined,
+      )).toBe('Laden…')
+    })
+  })
+
+  describe('scalars', () => {
+    it('formats BOOLEAN true as "Ja", false as "Nee"', () => {
+      const f = field({ field_type: FormFieldType.BOOLEAN })
+      expect(formatFieldValue(f, true, undefined, undefined)).toBe('Ja')
+      expect(formatFieldValue(f, false, undefined, undefined)).toBe('Nee')
+    })
+
+    it('stringifies unknown-type array values via join', () => {
+      const f = field({ field_type: FormFieldType.MULTISELECT })
+      expect(formatFieldValue(f, ['A', 'B'], undefined, undefined)).toBe('A, B')
+    })
+
+    it('stringifies scalars for text-like types', () => {
+      const f = field({ field_type: FormFieldType.TEXT })
+      expect(formatFieldValue(f, 'hello', undefined, undefined)).toBe('hello')
+    })
+  })
+})