feat: 添加 UI 状态管理，支持新增记录底部弹窗功能，优化设置和主页交互

src/stores/ui.js

@@ -0,0 +1,26 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+
+// 负责全局 UI 状态，例如新增记录的底部弹窗
+export const useUiStore = defineStore('ui', () => {
+  const addEntryVisible = ref(false)
+  const editingTransactionId = ref('')
+
+  const openAddEntry = (id = '') => {
+    editingTransactionId.value = id || ''
+    addEntryVisible.value = true
+  }
+
+  const closeAddEntry = () => {
+    addEntryVisible.value = false
+    editingTransactionId.value = ''
+  }
+
+  return {
+    addEntryVisible,
+    editingTransactionId,
+    openAddEntry,
+    closeAddEntry,
+  }
+})
+