Phase 3: Typed Vue components in scripts-v2/

Migrate all shared components to TypeScript SFCs with script setup
lang=ts. 72 files, 7144 lines, zero any types.

- components/base/ (42 files): Button, Input, Textarea, Checkbox,
  Radio, Switch, Badge, Card, Modal, Dialog, Dropdown, DatePicker,
  TimePicker, Money, FileUploader, Select, Icon, Loader, Multiselect,
  TabGroup, Wizard, CustomerSelect, ItemSelect, CustomInput, alerts,
  status badges (Invoice/Estimate/Paid/RecurringInvoice), List/ListItem
- components/table/ (3 files): DataTable, TablePagination
- components/form/ (4 files): FormGroup, FormGrid, SwitchSection
- components/layout/ (11 files): Page, PageHeader, Breadcrumb,
  FilterWrapper, EmptyPlaceholder, ContentPlaceholders, SettingCard
- components/editor/ (2 files): RichEditor with Tiptap
- components/charts/ (2 files): LineChart with Chart.js
- components/notifications/ (3 files): NotificationRoot, NotificationItem
- components/icons/ (2 files): MainLogo

All use defineProps<Props>(), defineEmits<Emits>(), typed refs,
and import domain types from types/domain.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

resources/scripts-v2/components/layout/ContentPlaceholderHeading.vue

@@ -0,0 +1,24 @@
+<template>
+  <div class="base-content-placeholders-heading">
+    <div v-if="box" class="base-content-placeholders-heading__box" />
+    <div class="base-content-placeholders-heading__content">
+      <div
+        class="base-content-placeholders-heading__title"
+        style="background: #eee"
+      />
+      <div class="base-content-placeholders-heading__subtitle" />
+    </div>
+  </div>
+</template>
+
+<script setup lang="ts">
+interface Props {
+  box?: boolean
+  rounded?: boolean
+}
+
+withDefaults(defineProps<Props>(), {
+  box: false,
+  rounded: false,
+})
+</script>