App mode - Unify menus - 2 (#9023)

## Summary

Updates subgraph breadcrumbs menu, workflow tabs context menu & linear
mode menu to use a single implementation.
Adds new menu items for enter/exit app mode  
Hides menu when in builder mode

## Changes

- **What**: Changes the components to use either a reka-ui context menu
or dropdown, with a standard inner list
- **Breaking**: Remove existing linear toggle from sidebar as it is now
in the menu


## Screenshots (if applicable)
It looks basically identical other than the icon changes based on mode:

In Graph Mode:
<img width="261" height="497" alt="image"
src="https://github.com/user-attachments/assets/eb9968a2-b528-4e21-9e14-ab4a67e717ae"
/>

In App Mode:
<img width="254" height="499" alt="image"
src="https://github.com/user-attachments/assets/54a89fab-e7b2-4cb0-bcb7-43d6d076ac83"
/>

Right click tab:
<img width="321" height="564" alt="image"
src="https://github.com/user-attachments/assets/c12c7d64-2dba-45bb-be76-2615f3e38cc6"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9023-App-mode-Unify-menus-2-30d6d73d36508162bfc0e308d5f705de)
by [Unito](https://www.unito.io)

---------

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

src/components/common/WorkflowActionsDropdown.vue

@@ -0,0 +1,77 @@
+<script setup lang="ts">
+import {
+  DropdownMenuContent,
+  DropdownMenuPortal,
+  DropdownMenuRoot,
+  DropdownMenuTrigger
+} from 'reka-ui'
+import { useI18n } from 'vue-i18n'
+
+import WorkflowActionsList from '@/components/common/WorkflowActionsList.vue'
+import Button from '@/components/ui/button/Button.vue'
+import { useWorkflowActionsMenu } from '@/composables/useWorkflowActionsMenu'
+import { useTelemetry } from '@/platform/telemetry'
+import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
+import { useCommandStore } from '@/stores/commandStore'
+
+const { source, align = 'start' } = defineProps<{
+  source: string
+  align?: 'start' | 'center' | 'end'
+}>()
+
+const { t } = useI18n()
+const canvasStore = useCanvasStore()
+
+const { menuItems } = useWorkflowActionsMenu(
+  () => useCommandStore().execute('Comfy.RenameWorkflow'),
+  { isRoot: true }
+)
+
+function handleOpen(open: boolean) {
+  if (open) {
+    useTelemetry()?.trackUiButtonClicked({
+      button_id: source
+    })
+  }
+}
+</script>
+
+<template>
+  <DropdownMenuRoot @update:open="handleOpen">
+    <DropdownMenuTrigger as-child>
+      <slot name="button">
+        <Button
+          v-tooltip="{
+            value: t('breadcrumbsMenu.workflowActions'),
+            showDelay: 300,
+            hideDelay: 300
+          }"
+          variant="secondary"
+          size="unset"
+          :aria-label="t('breadcrumbsMenu.workflowActions')"
+          class="h-10 rounded-lg pl-3 pr-2 pointer-events-auto gap-1 data-[state=open]:bg-secondary-background-hover data-[state=open]:shadow-interface"
+        >
+          <i
+            class="size-4"
+            :class="
+              canvasStore.linearMode
+                ? 'icon-[lucide--panels-top-left]'
+                : 'icon-[comfy--workflow]'
+            "
+          />
+          <i class="icon-[lucide--chevron-down] size-4 text-muted-foreground" />
+        </Button>
+      </slot>
+    </DropdownMenuTrigger>
+    <DropdownMenuPortal>
+      <DropdownMenuContent
+        :align
+        :side-offset="5"
+        :collision-padding="10"
+        class="z-1000 rounded-lg px-2 py-3 min-w-56 bg-base-background shadow-interface border border-border-subtle"
+      >
+        <WorkflowActionsList :items="menuItems" />
+      </DropdownMenuContent>
+    </DropdownMenuPortal>
+  </DropdownMenuRoot>
+</template>