## Summary
Fix input asset previews (images/videos) disappearing from
LoadImage/LoadVideo nodes after execution and a browser tab switch.
## Changes
- **What**: Guard `setOutputsByLocatorId` in `imagePreviewStore` to
preserve existing input-type preview images (`type: 'input'`) when the
incoming execution output has no images. Execution outputs with actual
images still overwrite as expected.
## Review Focus
- The guard only applies when existing output is an input preview (`type
=== 'input'` for all images) AND incoming output has no images — this is
the exact scenario where execution clobbers upload widget previews.
- Root cause: execution results from the backend overwrite the upload
widget's synthetic preview for LoadImage/LoadVideo nodes (which produce
no output images). Combined with the deferred resize-observer
re-observation from PR #8805, returning to a hidden tab reads the
now-empty store entry.
## Summary
Rename `imagePreviewStore.ts` → `nodeOutputStore.ts` to match the store
it houses (`useNodeOutputStore`, Pinia ID `nodeOutput`).
## Changes
- **What**: Rename file + test file, update all 21 import paths, mock
paths, and describe labels
- **Breaking**: None — exported symbol (`useNodeOutputStore`) and Pinia
store ID (`nodeOutput`) are unchanged
## Custom Node Ecosystem Audit
Searched the ComfyUI custom node ecosystem for `imagePreviewStore` and
`useNodeOutputStore`:
- **Not part of the public API** — neither filename nor export appear in
`comfyui_frontend_package` or `vite.types.config.mts`
- **1 external repo found:** `wallen0322/ComfyUI-AE-Animation` —
contains a full fork of the frontend source tree; it copies the file
internally and does not import from the published package. **No
breakage.**
- **No custom nodes import this store via the extension API.** This is a
safe internal-only rename.
## Review Focus
Pure mechanical rename — no logic changes. Verify no stale
`imagePreviewStore` references remain.
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-9416-refactor-rename-imagePreviewStore-to-nodeOutputStore-31a6d73d3650816086c5e62959861ddb)
by [Unito](https://www.unito.io)
Co-authored-by: Alexander Brown <drjkl@comfy.org>
