docs(input): add examples

docs/app/components/content/examples/input/InputCharacterLimitExample.vue

@@ -0,0 +1,24 @@
+<script setup lang="ts">
+const value = ref('')
+const maxLength = 15
+</script>
+
+<template>
+  <UInput
+    v-model="value"
+    :maxlength="maxLength"
+    aria-describedby="character-count"
+    :ui="{ trailing: 'pointer-events-none' }"
+  >
+    <template #trailing>
+      <div
+        id="character-count"
+        class="text-xs text-[var(--ui-text-muted)] tabular-nums"
+        aria-live="polite"
+        role="status"
+      >
+        {{ value?.length }}/{{ maxLength }}
+      </div>
+    </template>
+  </UInput>
+</template>