Previously findOwnReview returned only the single most-recent matching
review, so on PRs with multiple force-pushes only the latest old review
got superseded. The rest accumulated as unsuperseded stale reviews.

Changes:
- Add findAllOwnReviews() to collect all non-superseded matching reviews
- Loop over all old reviews in the supersede phase
- Add GetTimelineReviewCommentIDForReview() to find comment IDs by
  review ID (fetches review body, matches in timeline by prefix)
- Each old review gets independently superseded and its inline comments
  resolved

The old findOwnReview is kept for backward compat (tested, may be
useful as a utility).

@@ -426,6 +426,65 @@ func (c *Client) GetTimelineReviewCommentID(ctx context.Context, owner, repo str
 	return 0, fmt.Errorf("no timeline event found with sentinel")

@@ -324,4 +324,4 @@
 	if *reviewerName != "" {
 		existingReviews, err := giteaClient.ListReviews(ctx, owner, repoName, prNumber)
 		if err != nil {
 			slog.Warn("could not list existing reviews", "pr", prNumber, "error", err)

@@ -397,1 +382,4 @@
+			for _, c := range oldComments {
+				if c.ID == 0 {
+					continue
 				}

@@ -429,0 +449,4 @@
+	if review.Body == "" {
+		return 0, fmt.Errorf("review %d has empty body", reviewID)
+	}
+

@@ -429,0 +460,4 @@
+	for page := 1; ; page++ {
+		timelineURL := fmt.Sprintf("%s/api/v1/repos/%s/%s/issues/%d/timeline?limit=%d&page=%d",
+			c.baseURL,
+			url.PathEscape(owner),

@@ -646,2 +636,4 @@
 	return best
 }
+
+// findAllOwnReviews returns all non-superseded reviews matching the sentinel.

@@ -429,0 +457,4 @@
+	matchPrefix := review.Body
+	if len(matchPrefix) > 200 {
+		matchPrefix = matchPrefix[:200]
+	}