feat(compo):增加支持窗体拖动的组件。

src/components/WindowMoveHandler/WindowMoveHandler.tsx

@@ -0,0 +1,17 @@
+import { css } from "@emotion/react";
+import styled from "@emotion/styled";
+
+const Handler = styled.div(
+  ({ theme }) => css`
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    height: ${theme.spacings.xxs * 24}px;
+    z-index: 1;
+  `
+);
+
+export function WindowMoveHandler() {
+  return <Handler data-tauri-drag-region />;
+}

src/components/index.tsx

@@ -0,0 +1 @@
+export { WindowMoveHandler } from "./WindowMoveHandler/WindowMoveHandler";