feat(posts): make the like button a real toggle - #55
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PostDto now carries a per-viewer liked flag (batched lookup, never one query per post) so the feed and post page know whether the current reader already liked a post. LikeButton picks like vs unlike based on that flag and fills the heart when liked; useUnlikePost mirrors useLikePost's optimistic update/rollback, just decrementing and flipping liked false instead of true.
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Summary
PostDtonow carries a per-viewerlikedflag (undefined for anonymous readers), computed with one batched query per list/detail fetch rather than N+1.LikeButtontoggles between like (PUT) and unlike (DELETE) based on that flag, and fills the heart icon when liked.useLikePostand the newuseUnlikePostoptimistically fliplikedand the count, with rollback on error.Test plan
npm run test— 491 passing (15 new: server-sidelikedfield for anonymous/owner/isolation, client-side toggle dispatch, optimistic flip/rollback, filled vs outline heart)