It should have been noticed by the counter or gate agents that this passenger might need two seats. The FA should have also caught it. The ball was fumbled.
I would suggest you contact the manager of the station you flew out of, and make a complaint with them, so they in turn can talk to the employees. There really isn't much else they will do except to apologize to you, and maybe award you some miles.
Out of curiosity, did you talk to the Alaska desk when you landed?
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