Add telemetry for entering linear mode (#8263)

Standard disclaimer: Telemetry only applies on cloud builds

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8263-Add-telemetry-for-entering-linear-mode-2f16d73d3650819ea53efeeb562ea095)
by [Unito](https://www.unito.io)

src/components/sidebar/ModeToggle.vue

@@ -5,6 +5,11 @@ import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useCommandStore } from '@/stores/commandStore'
 
 const canvasStore = useCanvasStore()
+function toggleLinearMode() {
+  useCommandStore().execute('Comfy.ToggleLinear', {
+    metadata: { source: 'button' }
+  })
+}
 </script>
 <template>
   <div class="p-1 bg-secondary-background rounded-lg w-10">
@@ -12,7 +17,7 @@ const canvasStore = useCanvasStore()
       size="icon"
       :title="t('linearMode.linearMode')"
       :variant="canvasStore.linearMode ? 'inverted' : 'secondary'"
-      @click="useCommandStore().execute('Comfy.ToggleLinear')"
+      @click="toggleLinearMode"
     >
       <i class="icon-[lucide--panels-top-left]" />
     </Button>
@@ -20,7 +25,7 @@ const canvasStore = useCanvasStore()
       size="icon"
       :title="t('linearMode.graphMode')"
       :variant="canvasStore.linearMode ? 'secondary' : 'inverted'"
-      @click="useCommandStore().execute('Comfy.ToggleLinear')"
+      @click="toggleLinearMode"
     >
       <i class="icon-[comfy--workflow]" />
     </Button>