Missing optional chaining on actor_details and reaction_items in apps/space reactions and votes #10111

In apps/space/components/issues/reactions/issue-vote-reactions.tsx, the upvote tooltip on line 80 safely uses optional chaining when reading actor_details (allUpVotes.map((r) => r.actor_details?.display_name)), as do lines 51, 52, and 58 (vote.actor_details?.id). However, the downvote tooltip on line 125 accesses r.actor_details.display_name directly without optional chaining:

allDownVotes
  .map((r) => r.actor_details.display_name)
  .slice(0, VOTES_LIMIT)

Similarly, in apps/space/store/issue-detail.store.ts, addIssueVote (line 413) and removeIssueVote (line 428) guard against nullish vote_items and actor_details ((this.details[issueID].vote_items ?? []).filter((v) => v.actor_details?.id !== this.rootStore.user.data?.id)), whereas addIssueReaction (line 324: ...this.details[issueID].reaction_items) and removeIssueReaction (line 346: this.details[issueID].reaction_items.filter((_r) => !(_r.reaction === reactionHex && _r.actor_details.id === this.rootStore.user.data?.id))) right above them do not guard against nullish reaction_items or _r.actor_details.

Adding optional chaining on r.actor_details?.display_name in issue-vote-reactions.tsx and guarding reaction_items ?? [] / _r.actor_details?.id in issue-detail.store.ts prevents a TypeError when actor_details or reaction_items is absent. I can put up a small PR if that's helpful.