## Summary
Addresses review feedback from PR #9298 and resolves the divergence
between `ResultItemImpl.isImage` and `appendCloudResParam`'s image
classification.
### Changes
- **Unify suffix-based classification**: Replace narrow
`isImageBySuffix` (gif/webp only), `isVideoBySuffix` (webm/mp4), and
`isAudioBySuffix` with `getMediaTypeFromFilename()` from
shared-frontend-utils, using the same `IMAGE_EXTENSIONS` set (png, jpg,
jpeg, gif, webp, bmp, avif, tif, tiff) that `appendCloudResParam` uses
- **imageCompare.ts**: Pass `record.filename` to `appendCloudResParam`
(was called without filename, bypassing image-extension guard)
- **imagePreviewStore.ts**: Use per-image `image.filename` instead of
first image's filename for all images in batch
- **LinearControls.vue**: Use `resultItem.filename` (already a string)
instead of `String(filename)` which converts undefined to `"undefined"`
### Related review comments
- [imageCompare.ts — missing
filename](https://github.com/Comfy-Org/ComfyUI_frontend/pull/9298#discussion_r2886137498)
- [imagePreviewStore.ts — per-image
filename](https://github.com/Comfy-Org/ComfyUI_frontend/pull/9298#discussion_r2886138718)
- [LinearControls.vue —
String(filename)](https://github.com/Comfy-Org/ComfyUI_frontend/pull/9298#discussion_r2886140159)
- [queueStore.ts — diverging image
classification](https://github.com/Comfy-Org/ComfyUI_frontend/pull/9298#discussion_r2886142886)
## Test plan
- [x] 66 unit tests pass (queueStore + cloudPreviewUtil)
- [x] `pnpm typecheck` passes
- [x] `pnpm lint` passes
- Fixes#9386
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
## 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>
