Subgraph/workflow breadcrumbs menu updates (#7852)

## Summary
For users who don't use subgraphs, the workflow name in the top left can
be unnecessarily obstructive so this updated collapses it to a simple
icon until a subgraph is entered.

## Changes

- Add menu button to WorkflowTab for quick workflow actions
- Add menu and back button to SubgraphBreadcrumb
- Extract shared menu items to useBreadcrumbMenu composable
- Add Comfy.RenameWorkflow command for renaming persisted workflows
- Menu always shows root workflow menu, even when in subgraph

## Screenshots (if applicable)

<img width="399" height="396" alt="image"
src="https://github.com/user-attachments/assets/701ab60e-790f-4d1e-a817-dc42b2d98712"
/>
<img width="569" height="381" alt="image"
src="https://github.com/user-attachments/assets/fcea3ab0-8388-4c72-a649-1428c1defd6a"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7852-Subgraph-workflow-breadcrumbs-menu-updates-2df6d73d3650815b8490ca0a9a92d540)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: GitHub Action <action@github.com>

src/components/common/OverlayIcon.vue

@@ -0,0 +1,65 @@
+<template>
+  <span class="relative inline-flex items-center justify-center size-[1em]">
+    <i :class="mainIcon" class="text-[1em]" />
+    <i
+      :class="
+        cn(
+          subIcon,
+          'absolute leading-none pointer-events-none',
+          positionX === 'left' ? 'left-0' : 'right-0',
+          positionY === 'top' ? 'top-0' : 'bottom-0'
+        )
+      "
+      :style="subIconStyle"
+    />
+  </span>
+</template>
+
+<script setup lang="ts">
+import { computed } from 'vue'
+
+import { cn } from '@/utils/tailwindUtil'
+
+type Position = 'top' | 'bottom' | 'left' | 'right'
+
+export interface OverlayIconProps {
+  mainIcon: string
+  subIcon: string
+  positionX?: Position
+  positionY?: Position
+  offsetX?: number
+  offsetY?: number
+  subIconScale?: number
+}
+const {
+  mainIcon,
+  subIcon,
+  positionX = 'right',
+  positionY = 'bottom',
+  offsetX = 0,
+  offsetY = 0,
+  subIconScale = 0.6
+} = defineProps<OverlayIconProps>()
+
+const textShadow = [
+  `-1px -1px 0 rgba(0, 0, 0, 0.7)`,
+  `1px -1px 0 rgba(0, 0, 0, 0.7)`,
+  `-1px 1px 0 rgba(0, 0, 0, 0.7)`,
+  `1px 1px 0 rgba(0, 0, 0, 0.7)`,
+  `-1px 0 0 rgba(0, 0, 0, 0.7)`,
+  `1px 0 0 rgba(0, 0, 0, 0.7)`,
+  `0 -1px 0 rgba(0, 0, 0, 0.7)`,
+  `0 1px 0 rgba(0, 0, 0, 0.7)`
+].join(', ')
+
+const subIconStyle = computed(() => ({
+  fontSize: `${subIconScale}em`,
+  textShadow,
+  ...(offsetX !== 0 && {
+    [positionX === 'left' ? 'left' : 'right']: `${offsetX}px`
+  }),
+  ...(offsetY !== 0 && {
+    [positionY === 'top' ? 'top' : 'bottom']: `${offsetY}px`
+  })
+}))
+</script>