feat: resolve old inline comments when superseding review

Closes #27

After superseding an old review, resolves all its inline comments via
POST /pulls/comments/{id}/resolve. This clears unresolved conversation
markers from the PR timeline/diff view.

New API methods:
- ListReviewComments: GET /repos/.../pulls/{n}/reviews/{id}/comments
- ResolveComment: POST /repos/.../pulls/comments/{id}/resolve

Failures are non-fatal (debug log) — the review still posts and
supersedes even if resolution fails.

cmd/review-bot/main.go

@@ -362,6 +362,27 @@ func main() {
 		} else {
 			slog.Info("marked old review as superseded", "old_state", existingReview.State, "new_review_id", posted.ID, "pr", prNumber)
 		}
+
+		// Resolve old review's inline comments (clears unresolved conversations in PR timeline)
+		oldComments, err := giteaClient.ListReviewComments(ctx, owner, repoName, prNumber, existingReview.ID)
+		if err != nil {
+			slog.Warn("could not list old review comments for resolution", "review_id", existingReview.ID, "error", err)
+		} else {
+			resolved := 0
+			for _, c := range oldComments {
+				if c.ID == 0 {
+					continue
+				}
+				if err := giteaClient.ResolveComment(ctx, owner, repoName, c.ID); err != nil {
+					slog.Debug("could not resolve inline comment", "comment_id", c.ID, "error", err)
+				} else {
+					resolved++
+				}
+			}
+			if resolved > 0 {
+				slog.Info("resolved old inline comments", "count", resolved, "pr", prNumber)
+			}
+		}
 	}
 
 }

gitea/client.go

@@ -82,6 +82,7 @@ type ChangedFile struct {
 
 // ReviewComment represents an inline comment to attach to a review.
 type ReviewComment struct {
+	ID          int64  `json:"id,omitempty"`
 	Path        string `json:"path"`
 	NewPosition int64  `json:"new_position"`
 	Body        string `json:"body"`
@@ -460,3 +461,49 @@ func (c *Client) EditComment(ctx context.Context, owner, repo string, commentID
 	}
 	return nil
 }
+
+// ListReviewComments returns the inline comments attached to a specific review.
+func (c *Client) ListReviewComments(ctx context.Context, owner, repo string, prNumber int, reviewID int64) ([]ReviewComment, error) {
+	reqURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/%d/reviews/%d/comments",
+		c.baseURL,
+		url.PathEscape(owner),
+		url.PathEscape(repo),
+		prNumber,
+		reviewID)
+	body, err := c.doGet(ctx, reqURL)
+	if err != nil {
+		return nil, fmt.Errorf("list review comments: %w", err)
+	}
+	var comments []ReviewComment
+	if err := json.Unmarshal(body, &comments); err != nil {
+		return nil, fmt.Errorf("parse review comments: %w", err)
+	}
+	return comments, nil
+}
+
+// ResolveComment marks an inline review comment as resolved.
+func (c *Client) ResolveComment(ctx context.Context, owner, repo string, commentID int64) error {
+	reqURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/pulls/comments/%d/resolve",
+		c.baseURL,
+		url.PathEscape(owner),
+		url.PathEscape(repo),
+		commentID)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, reqURL, nil)
+	if err != nil {
+		return fmt.Errorf("create resolve request: %w", err)
+	}
+	req.Header.Set("Authorization", "token "+c.token)
+
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return fmt.Errorf("resolve comment: %w", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated && resp.StatusCode != http.StatusNoContent {
+		body, _ := io.ReadAll(resp.Body)
+		return fmt.Errorf("resolve comment failed (status %d): %s", resp.StatusCode, body)
+	}
+	return nil
+}