tool strip button, execute current command

packages/web/src/buttons/ToolStripSplitDropDownButton.svelte

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+<script lang="ts">
+  import { currentDropDownMenu } from '../stores';
+
+  import ToolStripButton from './ToolStripButton.svelte';
+  import ToolStripSplitButton from './ToolStripSplitButton.svelte';
+
+  export let menu;
+  export let title = undefined;
+  export let label;
+  export let icon;
+  export let component = ToolStripButton;
+
+  function handleClick(e) {
+    const rect = e.detail.target.getBoundingClientRect();
+    const left = rect.left;
+    const top = rect.bottom;
+    currentDropDownMenu.set({ left, top, items: menu });
+  }
+</script>
+
+<ToolStripSplitButton {title} {icon} on:splitclick={handleClick} on:click>
+  <slot />
+</ToolStripSplitButton>