Fix video display and download with proper media types

- video_src_for_request now returns /raw endpoint for video source
- /raw endpoint sets proper Content-Type based on file format
- /raw endpoint sets filename with extension for downloads

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

server.py

@@ -2162,7 +2162,28 @@ async def get_cached_raw(content_hash: str):
     cache_path = get_cache_path(content_hash)
     if not cache_path:
         raise HTTPException(404, f"Content {content_hash} not in cache")
-    return FileResponse(cache_path)
+
+    # Detect media type and set appropriate content-type and filename
+    media_type_name = detect_media_type(cache_path)
+    if media_type_name == "video":
+        # Check actual format
+        with open(cache_path, "rb") as f:
+            header = f.read(12)
+        if header[:4] == b'\x1a\x45\xdf\xa3':  # WebM/MKV
+            return FileResponse(cache_path, media_type="video/x-matroska", filename=f"{content_hash}.mkv")
+        elif header[4:8] == b'ftyp':  # MP4
+            return FileResponse(cache_path, media_type="video/mp4", filename=f"{content_hash}.mp4")
+        return FileResponse(cache_path, media_type="video/mp4", filename=f"{content_hash}.mp4")
+    elif media_type_name == "image":
+        with open(cache_path, "rb") as f:
+            header = f.read(8)
+        if header[:8] == b'\x89PNG\r\n\x1a\n':
+            return FileResponse(cache_path, media_type="image/png", filename=f"{content_hash}.png")
+        elif header[:2] == b'\xff\xd8':
+            return FileResponse(cache_path, media_type="image/jpeg", filename=f"{content_hash}.jpg")
+        return FileResponse(cache_path, media_type="image/jpeg", filename=f"{content_hash}.jpg")
+
+    return FileResponse(cache_path, filename=f"{content_hash}.bin")
 
 
 @app.get("/cache/{content_hash}/mp4")
@@ -3609,10 +3630,10 @@ def is_ios_request(request: Request) -> bool:
 
 
 def video_src_for_request(content_hash: str, request: Request) -> str:
-    """Get video src URL, using MP4 endpoint for iOS."""
+    """Get video src URL, using MP4 endpoint for iOS, raw for others."""
     if is_ios_request(request):
         return f"/cache/{content_hash}/mp4"
-    return f"/cache/{content_hash}"
+    return f"/cache/{content_hash}/raw"
 
 
 def detect_media_type(cache_path: Path) -> str: