Add price checker demo

src/components/Inputs/TextInput.vue

@@ -0,0 +1,21 @@
+<script setup lang="ts">
+const props = defineProps<{
+  modelValue: string;
+}>();
+
+const emits = defineEmits<{
+  (e: "update:modelValue", value: string): void;
+  (e: "blur"): void;
+  (e: "focus"): void;
+}>();
+</script>
+
+<template>
+  <input
+    :value="props.modelValue"
+    @input="emits('update:modelValue', (<HTMLInputElement>$event.target).value)"
+    @blur="emits('blur')"
+    @focus="emits('focus')"
+    type="text"
+  />
+</template>