Allow (different) creator heart reaction on own threads

If someone replies to a comment thread of mine and even though I'm not the claim/channel owner, I still should be able to react with a heart. Will ensure commetron allows this.

Start by tracing the comment-thread reaction handling in the Electron/React application, focusing on how creator and claim/channel ownership are checked. Confirm the behavior of commetron and identify the existing reaction tests or UI entry point. Done means a thread creator can add a heart reaction to replies on their own thread without being the claim or channel owner.

Written by the indexing model from the issue text.