feat(add modal stack): created modal stack and confirmation

base/app.vue

@@ -0,0 +1,27 @@
+<template>
+  <ModalStack />
+</template>
+
+<script setup lang="ts">
+onMounted(() => {
+  createModal(
+    ModalType.Confirmation,
+    {
+      title: "Are you sure?",
+      description:
+        "Are you sure you want to complete this action? It may have unintended side effects.",
+    },
+    async (event, close) => {
+      switch (event) {
+        case "confirm":
+          await new Promise((r) => setTimeout(r, 3000));
+          close();
+          break;
+        case "cancel":
+          close();
+          break;
+      }
+    }
+  );
+});
+</script>