refactor: unify image classification and fix cloud preview param handling (#9408)

## 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>

src/extensions/core/imageCompare.ts

@@ -29,7 +29,7 @@ useExtensionService().registerExtension({
 
       const toUrl = (record: Record<string, string>) => {
         const params = new URLSearchParams(record)
-        appendCloudResParam(params)
+        appendCloudResParam(params, record.filename)
         return api.apiURL(`/view?${params}${rand}`)
       }
 

src/renderer/extensions/linearMode/LinearControls.vue

@@ -90,7 +90,7 @@ function getDropIndicator(node: LGraphNode) {
   const buildImageUrl = () => {
     if (!filename) return undefined
     const params = new URLSearchParams(resultItem)
-    appendCloudResParam(params, String(filename))
+    appendCloudResParam(params, resultItem.filename)
     return api.apiURL(`/view?${params}${app.getPreviewFormatParam()}`)
   }
 

src/stores/nodeOutputStore.ts

@@ -121,11 +121,10 @@ export const useNodeOutputStore = defineStore('nodeOutput', () => {
     const rand = app.getRandParam()
     const previewParam = getPreviewParam(node, outputs)
     const isImage = isImageOutputs(node, outputs)
-    const firstFilename = outputs.images[0]?.filename
 
     return outputs.images.map((image) => {
       const params = new URLSearchParams(image)
-      if (isImage) appendCloudResParam(params, firstFilename)
+      if (isImage) appendCloudResParam(params, image.filename)
       return api.apiURL(`/view?${params}${previewParam}${rand}`)
     })
   }

src/stores/queueStore.ts

@@ -114,6 +114,9 @@ export class ResultItemImpl {
     if (this.isMp4) {
       return 'video/mp4'
     }
+    if (this.filename.endsWith('.mov')) {
+      return 'video/quicktime'
+    }
 
     if (this.isVhsFormat) {
       if (this.format?.endsWith('webm')) {
@@ -142,14 +145,6 @@ export class ResultItemImpl {
     return undefined
   }
 
-  get isGif(): boolean {
-    return this.filename.endsWith('.gif')
-  }
-
-  get isWebp(): boolean {
-    return this.filename.endsWith('.webp')
-  }
-
   get isWebm(): boolean {
     return this.filename.endsWith('.webm')
   }
@@ -159,11 +154,11 @@ export class ResultItemImpl {
   }
 
   get isVideoBySuffix(): boolean {
-    return this.isWebm || this.isMp4
+    return getMediaTypeFromFilename(this.filename) === 'video'
   }
 
   get isImageBySuffix(): boolean {
-    return this.isGif || this.isWebp
+    return getMediaTypeFromFilename(this.filename) === 'image'
   }
 
   get isMp3(): boolean {
@@ -183,7 +178,7 @@ export class ResultItemImpl {
   }
 
   get isAudioBySuffix(): boolean {
-    return this.isMp3 || this.isWav || this.isOgg || this.isFlac
+    return getMediaTypeFromFilename(this.filename) === 'audio'
   }
 
   get isVideo(): boolean {