refactor(portal): move components to shared/public-form and portal/{event,*}

- public-form/** (18 files + 7 component tests) → shared/public-form/**
  This is the runtime form-renderer; goes into shared/ because it will
  be reused by the organizer-app Form Builder preview (S3b).
- event/{Claimen,Informatie,Overzicht,Rooster}Tab.vue → portal/event/**
- portal/{StatusCard,EventCard,UserAvatarMenu}.vue → portal/** (no
  path change — both apps had a portal/ subfolder).
- AppLoadingIndicator.vue, auth/{PasswordRequirements,MfaChallengeCard}.vue,
  settings/Mfa{Disable,Email,Totp}SetupDialog.vue: portal copies
  deleted as duplicates of pre-existing apps/app components (diffs
  were trivial formatting only).

Inside the moved files: rewrote @form-schema/* → @/composables/forms/*
and @/components/{public-form,event/[Tab]} → new sub-zone paths.

Updated apps/app/tsconfig.json to drop the @form-schema path alias
and the packages/form-schema include path. Updated formSchema.ts to
import from @/composables/forms/types/formBuilder. Carried the
crypto polyfill from apps/portal/tests/setup.ts into
apps/app/tests/setup.ts (needed by useFormDraft tests landing in C.4).

NOTE: Some moved tests still fail because they reference portal
composables (usePublicFormSections, useFormDraft) that move in C.4.

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

apps/app/src/components/shared/public-form/FieldText.vue

@@ -0,0 +1,35 @@
+<script setup lang="ts">
+import type { PublicFormField } from '@/composables/forms/types/formBuilder'
+import { getValidatorsForField } from '@/composables/forms/utils/formValidation'
+
+const props = defineProps<{
+  field: PublicFormField
+  modelValue: unknown
+  errorMessages?: string[]
+}>()
+
+const emit = defineEmits<{
+  (e: 'update:modelValue', v: string): void
+  (e: 'blur'): void
+}>()
+
+const rules = computed(() => getValidatorsForField(props.field))
+const model = computed({
+  get: () => (props.modelValue ?? '') as string,
+  set: (v: string) => emit('update:modelValue', v),
+})
+</script>
+
+<template>
+  <AppTextField
+    v-model="model"
+    :label="field.label"
+    :hint="field.help_text ?? undefined"
+    persistent-hint
+    :rules="rules"
+    :error-messages="errorMessages"
+    :required="field.is_required"
+    :maxlength="field.validation_rules?.max_length ?? undefined"
+    @blur="emit('blur')"
+  />
+</template>