fix: address review findings

- Tighten timeline matching: also check ev.User.Login matches
  the review author (prevents collision on identical body prefix)
- Remove unused sharedTokenMode variable (inline condition)
- Aggregate resolution failures with warn-level summary

gitea/client.go

@@ -442,6 +442,9 @@ func (c *Client) GetTimelineReviewCommentIDForReview(ctx context.Context, owner,
 	}
 	var review struct {
 		Body string `json:"body"`
+		User struct {
+			Login string `json:"login"`
+		} `json:"user"`
 	}
 	if err := json.Unmarshal(body, &review); err != nil {
 		return 0, fmt.Errorf("parse review %d: %w", reviewID, err)
@@ -474,7 +477,7 @@ func (c *Client) GetTimelineReviewCommentIDForReview(ctx context.Context, owner,
 			return 0, fmt.Errorf("parse timeline (page %d): %w", page, err)
 		}
 		for _, ev := range events {
-			if ev.Type == "review" && strings.HasPrefix(ev.Body, matchPrefix) {
+			if ev.Type == "review" && ev.User.Login == review.User.Login && strings.HasPrefix(ev.Body, matchPrefix) {
 				return ev.ID, nil
 			}
 		}