feat(forms): add useMaskedField and useMaskedInput composables for input masking

docs/app/components/DocsText.vue

@@ -0,0 +1,33 @@
+<script setup lang="ts">
+// Renders a short description with inline markdown (bold / `code` / links /
+// {@link}). Content is authored by us (JSDoc), so v-html is safe here.
+const props = defineProps<{ text?: string | null }>();
+
+const html = computed(() => renderInline(props.text ?? ''));
+</script>
+
+<template>
+  <span class="docs-text" v-html="html" />
+</template>
+
+<style scoped>
+.docs-text :deep(code) {
+  font-family: ui-monospace, monospace;
+  font-size: 0.9em;
+  background: var(--bg-inset);
+  border: 1px solid var(--border);
+  border-radius: 0.25rem;
+  padding: 0.05em 0.3em;
+}
+
+.docs-text :deep(a) {
+  color: var(--accent-text);
+  text-decoration: underline;
+  text-underline-offset: 2px;
+}
+
+.docs-text :deep(strong) {
+  font-weight: 600;
+  color: var(--fg);
+}
+</style>