fix: app mode widgets disappear after hard refresh (#9621)

## Summary

Fix all app mode widgets (including seed) disappearing after hard
refresh due to a race condition in `pruneLinearData` and a missing
reactivity dependency in `mappedSelections`.

## Changes

- **What**: Guard `pruneLinearData` with `!ChangeTracker.isLoadingGraph`
so inputs are preserved while `rootGraph.configure()` hasn't populated
nodes yet. Add `graphNodes` dependency to `mappedSelections` computed in
`LinearControls.vue` so it re-evaluates when the graph finishes
configuring.

## Review Focus

The core fix is a one-line guard change: `app.rootGraph &&
!ChangeTracker.isLoadingGraph` instead of just `app.rootGraph`. The
previous guard failed because `rootGraph` exists as an empty graph
during loading — `resolveNode()` returns `undefined` for all nodes and
everything gets filtered out.

Fixes COM-16193

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9621-fix-app-mode-widgets-disappear-after-hard-refresh-31d6d73d3650811193f5e1bc8f3c15c8)
by [Unito](https://www.unito.io)

---------

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

src/renderer/extensions/linearMode/LinearControls.vue

@@ -64,6 +64,7 @@ useEventListener(
 )
 
 const mappedSelections = computed(() => {
+  void graphNodes.value
   let unprocessedInputs = appModeStore.selectedInputs.flatMap(
     ([nodeId, widgetName]) => {
       const [node, widget] = resolveNodeWidget(nodeId, widgetName)

src/stores/appModeStore.test.ts

@@ -25,7 +25,7 @@ const mockEmptyWorkflowDialog = vi.hoisted(() => {
 
 vi.mock('@/scripts/app', () => ({
   app: {
-    rootGraph: { extra: {}, nodes: [{ id: 1 }] }
+    rootGraph: { extra: {}, nodes: [{ id: 1 }], events: new EventTarget() }
   }
 }))
 
@@ -242,6 +242,29 @@ describe('appModeStore', () => {
       expect(store.selectedOutputs).toEqual([1])
     })
 
+    it('reloads selections on configured event', async () => {
+      const node1 = mockNode(1)
+
+      // Initially nodes are not resolvable — pruning removes them
+      mockResolveNode.mockReturnValue(undefined)
+      workflowStore.activeWorkflow = workflowWithLinearData([[1, 'seed']], [1])
+      await nextTick()
+      expect(store.selectedInputs).toEqual([])
+      expect(store.selectedOutputs).toEqual([])
+
+      // After graph configures, nodes become resolvable
+      mockResolveNode.mockImplementation((id) =>
+        id == 1 ? (node1 as unknown as LGraphNode) : undefined
+      )
+      ;(app.rootGraph.events as EventTarget).dispatchEvent(
+        new Event('configured')
+      )
+      await nextTick()
+
+      expect(store.selectedInputs).toEqual([[1, 'seed']])
+      expect(store.selectedOutputs).toEqual([1])
+    })
+
     it('hasOutputs is false when all output nodes are deleted', async () => {
       mockResolveNode.mockReturnValue(undefined)
 

src/stores/appModeStore.ts

@@ -1,5 +1,6 @@
 import { defineStore } from 'pinia'
 import { reactive, computed, watch } from 'vue'
+import { useEventListener } from '@vueuse/core'
 
 import { useEmptyWorkflowDialog } from '@/components/builder/useEmptyWorkflowDialog'
 import { useAppMode } from '@/composables/useAppMode'
@@ -76,6 +77,12 @@ export const useAppModeStore = defineStore('appMode', () => {
     { immediate: true }
   )
 
+  useEventListener(
+    () => app.rootGraph?.events,
+    'configured',
+    resetSelectedToWorkflow
+  )
+
   watch(
     () =>
       isBuilderMode.value