fix(stories): show the source filename on imported clips

Imports were rendering as "Imported Audio" everywhere because every
import points at the singleton voice profile. The filename was already
being stored on the generation row (in the `text` field), so the chat
item title and the timeline clip label now read from `text` when
`engine === 'import'` and fall back to the profile name otherwise. The
chat item also drops the language pill (always "en" on imports — not
informative) and skips the transcript textarea since imports have no
spoken text to show.

app/src/components/StoriesTab/StoryChatItem.tsx

@@ -106,18 +106,24 @@ export function StoryChatItem({
       {/* Content */}
       <div className="flex-1 min-w-0">
         <div className="flex items-center gap-2 mb-2">
-          <span className="font-medium text-sm">{item.profile_name}</span>
-          <span className="text-xs text-muted-foreground">{item.language}</span>
+          <span className="font-medium text-sm truncate">
+            {item.engine === 'import' ? item.text : item.profile_name}
+          </span>
+          {item.engine !== 'import' && (
+            <span className="text-xs text-muted-foreground">{item.language}</span>
+          )}
           <span className="text-xs text-muted-foreground tabular-nums ml-auto">
             {formatTime(itemStartMs)}
           </span>
         </div>
-        <Textarea
-          value={item.text}
-          className="flex-1 resize-none text-sm text-muted-foreground select-text bg-card cursor-text"
-          readOnly
-          onDoubleClick={handlePlay}
-        />
+        {item.engine === 'import' ? null : (
+          <Textarea
+            value={item.text}
+            className="flex-1 resize-none text-sm text-muted-foreground select-text bg-card cursor-text"
+            readOnly
+            onDoubleClick={handlePlay}
+          />
+        )}
       </div>
 
       {/* Actions */}

app/src/components/StoriesTab/StoryTrackEditor.tsx

@@ -1270,7 +1270,7 @@ export function StoryTrackEditor({ storyId, items }: StoryTrackEditorProps) {
                       {/* Clip label */}
                       <div className="absolute top-0 left-1 right-1 z-10">
                         <p className="text-[9px] font-medium text-accent-foreground truncate">
-                          {item.profile_name}
+                          {item.engine === 'import' ? item.text : item.profile_name}
                         </p>
                       </div>
                       {/* Waveform */}