Fix subtitle file upload - remove pre-upload step and send file directly to API

frontend/app/video/subtitles/page.tsx

@@ -79,39 +79,7 @@ export default function SubtitlesPage() {
 
   const handleFileUpload = async (uploadedFile: File) => {
     setFile(uploadedFile);
-    setUploading(true);
-
-    try {
-      const response = await assetsApi.upload(uploadedFile);
-      setAssetId(response.data.id);
-      toast.success('Video uploaded!');
-    } catch (err: any) {
-      if (err.response?.status === 409) {
-        const existingAssetId = err.response.data.detail.asset_id;
-        const shouldOverwrite = window.confirm(
-          `File "${uploadedFile.name}" already exists. \nClick OK to Overwrite, Cancel to Use Existing.`
-        );
-
-        if (shouldOverwrite) {
-          try {
-            const response = await assetsApi.upload(uploadedFile, undefined, false, true);
-            setAssetId(response.data.id);
-            toast.success('Video overwritten!');
-          } catch (retryErr: any) {
-            toast.error('Failed to overwrite video');
-            setFile(null);
-          }
-        } else {
-          setAssetId(existingAssetId);
-          toast('Using existing file', { icon: 'ℹ️' });
-        }
-      } else {
-        toast.error('Failed to upload video');
-        setFile(null);
-      }
-    } finally {
-      setUploading(false);
-    }
+    toast.success('Video ready for processing!');
   };
 
   const handleProcess = async () => {
@@ -253,9 +221,6 @@ export default function SubtitlesPage() {
               }}
               label="Upload a video for transcription"
             />
-            {uploading && (
-              <p className="mt-2 text-sm text-forge-yellow">Uploading...</p>
-            )}
           </div>
 
           {/* Languages */}
@@ -407,7 +372,7 @@ export default function SubtitlesPage() {
           {/* Process Button */}
           <button
             onClick={handleProcess}
-            disabled={loading || !file || uploading}
+            disabled={loading || !file}
             className="btn-primary w-full flex items-center justify-center gap-2 disabled:opacity-50 disabled:cursor-not-allowed"
           >
             <Sparkles className="w-5 h-5" />