style(app): apply eslint --fix to Tier 1 (Vue templates)

WS-3 session 1b-i Tier 1.

Scope: src/components/**, src/pages/**, src/layouts/**, src/views/**
restricted to *.vue files. Mechanical formatting only — predominantly
vue/html-indent (506 fixes in CrowdListDetailPanel.vue alone),
padding-line-between-statements, antfu/if-newline.

Excludes (per session prompt):
- apps/app/vite.config.ts (Tier 3)
- apps/app/themeConfig.ts (Tier 3)
- apps/app/vitest.config.ts (Tier 3)
- All TypeScript-only files in src/composables, src/lib, src/stores,
  src/plugins, src/types (Tier 2 — separate commit)

Includes session 1a layouts (PortalLayout.vue, PublicLayout.vue) where
2 'lines-around-comment' errors were flagged in the previous 1b-i
pre-flight inspection.

Tests + typecheck verified green post-fix:
- apps/app vitest: 49 passed (unchanged)
- apps/app vue-tsc: clean (unchanged)
- apps/portal vitest: 113 passed (unchanged — not touched)
- backend pest: 1486 passed (unchanged — not touched)

Lint baseline progression:
- Pre-Tier-1: 1451 problems
- Post-Tier-1: 422 problems

Visual smoke status:
- NOT YET SMOKED — Bert to verify before merge. This Claude Code
  session has no UI access; cannot run pnpm dev and click through
  affected routes. The high-traffic candidates are
  CrowdListDetailPanel (506 fixes), AssignPersonDialog (44),
  ShiftDetailPanel (36), and the events / form-failures pages.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

apps/app/src/components/event/RegistrationFieldFormDialog.vue

@@ -1,11 +1,11 @@
 <script setup lang="ts">
 import { VForm } from 'vuetify/components/VForm'
+import type { AxiosError } from 'axios'
 import { usePersonTagCategories } from '@/composables/api/usePersonTags'
 import { requiredValidator } from '@core/utils/validators'
 import type { RegistrationFormField, RegistrationFormFieldCreateDTO } from '@/types/registration-form-field'
-import type { RegistrationFieldType, FieldDisplayWidth } from '@/types/registration-field-template'
+import type { FieldDisplayWidth, RegistrationFieldType } from '@/types/registration-field-template'
 import { FIELD_TYPES_WITH_OPTIONS } from '@/types/registration-field-template'
-import type { AxiosError } from 'axios'
 import type { ApiErrorResponse } from '@/types/auth'
 
 const props = defineProps<{
@@ -75,7 +75,7 @@ const showOptions = computed(() =>
 
 const showTagCategory = computed(() => form.value.field_type === 'tag_picker')
 
-watch(modelValue, (open) => {
+watch(modelValue, open => {
   if (open) {
     errors.value = {}
     if (props.field) {
@@ -110,18 +110,19 @@ function removeOption(index: number) {
 
 function onSubmit() {
   refVForm.value?.validate().then(({ valid }) => {
-    if (!valid) return
+    if (!valid)
+      return
 
     errors.value = {}
+
     const payload: Partial<RegistrationFormFieldCreateDTO> = {
       label: form.value.label,
       help_text: form.value.help_text || null,
       display_width: form.value.display_width,
     }
 
-    if (!props.field) {
+    if (!props.field)
       payload.field_type = form.value.field_type as RegistrationFieldType
-    }
 
     if (!isHeading.value) {
       payload.is_required = form.value.is_required
@@ -141,12 +142,11 @@ function onSubmit() {
         payload.options = null
       }
 
-      if (showTagCategory.value) {
+      if (showTagCategory.value)
         payload.tag_categories = form.value.tag_categories.length > 0 ? form.value.tag_categories : null
-      }
-      else {
+
+      else
         payload.tag_categories = null
-      }
     }
 
     emit('save', payload)