Really nice camera you have. Was the roll loose when you handled it (out of the camera)? Light can hit the film on the edges when getting it put in the camera, or when you take it out and handle it and tape it up or whatever. Since you say the leak is so even along the edges, that's what it could be.
As far as the seals on the camera, from what I've seen, and I don't profess do have any vast expanse of knowledge or experience, but have see numerous folders, they seem to relay on a mechanical light seal, in other words overlap of the parts that fit together. Although maybe you will sometimes see yarn having been used in older cameras to seal out the light. Foam and even yarn is temporary, and the old folders just didn't seem to go for that. They were built for the long haul and handing down. Yarn is better than foam tough, IMO.
Try more film and be very careful to keep the roll tight going in and out of the camera. Just a thought. Your camera looks nice and looks to be in nice condition. Eyeball where the door meets up with the body. If it's all straight and snug, then suspect light hitting the edges during handling of the film out of the camera. It happened to me once.
If the lens is ok on your camera it will probably take amazing pictures. Also, I do not concur with the service recommendation given earlier. Best of luck with your nice folder camera.