fix: address coderabbit review — a11y, error handling, defensive guards

- Guard widget.options with optional chaining (RC1)
- Await async handleUpload in file input/drop handlers (M4)
- Add toast warning on cloud media verification failure (M5)
- Add aria-labels to confirm/cancel icon buttons (m1)
- Expand clearMissingMedia test to verify full lifecycle reset (n8)

src/locales/en/main.json

@@ -3539,7 +3539,9 @@
       "uploading": "Uploading...",
       "uploaded": "Uploaded",
       "selectedFromLibrary": "Selected from library",
-      "useFromLibrary": "Use from Library"
+      "useFromLibrary": "Use from Library",
+      "confirmSelection": "Confirm selection",
+      "cancelSelection": "Cancel selection"
     }
   },
   "errorOverlay": {

src/platform/missingMedia/components/MissingMediaRow.vue

@@ -37,6 +37,7 @@
       <Button
         variant="textonly"
         size="icon-sm"
+        :aria-label="t('rightSidePanel.missingMedia.confirmSelection')"
         :disabled="!isPending"
         :class="
           cn(
@@ -164,6 +165,7 @@
           <Button
             variant="textonly"
             size="icon-sm"
+            :aria-label="t('rightSidePanel.missingMedia.cancelSelection')"
             class="relative z-10 size-6 shrink-0 text-muted-foreground hover:text-base-foreground"
             @click="cancelSelection(item.name)"
           >
@@ -302,20 +304,23 @@ function openFilePicker() {
   fileInputRef.value?.click()
 }
 
-function handleFileInputChange(e: Event) {
+async function handleFileInputChange(e: Event) {
   const input = e.target as HTMLInputElement
   const file = input.files?.[0]
-  if (file) {
-    handleUpload(file, item.name, item.mediaType)
+  try {
+    if (file) {
+      await handleUpload(file, item.name, item.mediaType)
+    }
+  } finally {
+    input.value = ''
   }
-  input.value = ''
 }
 
-function handleDrop(e: DragEvent) {
+async function handleDrop(e: DragEvent) {
   isDragOver.value = false
   const file = e.dataTransfer?.files[0]
   if (file) {
-    handleUpload(file, item.name, item.mediaType)
+    await handleUpload(file, item.name, item.mediaType)
   }
 }
 </script>

src/platform/missingMedia/composables/useMissingMediaInteractions.ts

@@ -48,7 +48,7 @@ function resolveComboOptions(
   const result = getMediaComboWidget(candidate)
   if (!result) return []
 
-  const values = result.widget.options.values
+  const values = result.widget.options?.values
   if (!values) return []
 
   const list: string[] =

src/platform/missingMedia/missingMediaStore.test.ts

@@ -67,18 +67,29 @@ describe('useMissingMediaStore', () => {
     expect(store.hasMissingMedia).toBe(false)
   })
 
-  it('clearMissingMedia resets all state', () => {
+  it('clearMissingMedia resets all state including interaction state', () => {
     const store = useMissingMediaStore()
     store.setMissingMedia([
       makeCandidate('1', 'photo.png'),
       makeCandidate('2', 'clip.mp4', 'video')
     ])
+    store.expandState['photo.png'] = true
+    store.uploadState['photo.png'] = {
+      fileName: 'photo.png',
+      status: 'uploaded'
+    }
+    store.pendingSelection['photo.png'] = 'uploaded/photo.png'
+    const controller = store.createVerificationAbortController()
 
     store.clearMissingMedia()
 
     expect(store.missingMediaCandidates).toBeNull()
     expect(store.hasMissingMedia).toBe(false)
     expect(store.missingMediaCount).toBe(0)
+    expect(controller.signal.aborted).toBe(true)
+    expect(store.expandState).toEqual({})
+    expect(store.uploadState).toEqual({})
+    expect(store.pendingSelection).toEqual({})
   })
 
   it('missingMediaNodeIds tracks unique node IDs', () => {

src/scripts/app.ts

@@ -1594,6 +1594,14 @@ export class ComfyApp {
             '[Missing Media Pipeline] Asset verification failed:',
             err
           )
+          useToastStore().add({
+            severity: 'warn',
+            summary: st(
+              'toastMessages.missingMediaVerificationFailed',
+              'Failed to verify missing media. Some inputs may not be shown in the Errors tab.'
+            ),
+            life: 5000
+          })
         })
     } else {
       const confirmed = candidates.filter((c) => c.isMissing === true)