termui: check sketch-host remote when formatting cherry-pick command

Update getGitRefName function to look for commit references in the
sketch-host remote when local branch names are not available.
This makes the cherry-pick command display more user-friendly
by using remote branch names when possible.

Co-Authored-By: sketch <hello@sketch.dev>
diff --git a/termui/termui.go b/termui/termui.go
index e6e5b4e..3a0be7a 100644
--- a/termui/termui.go
+++ b/termui/termui.go
@@ -404,7 +404,7 @@
 
 // getGitRefName returns a readable git ref for sha, falling back to the original sha on error.
 func getGitRefName(sha string) string {
-	// branch or tag name
+	// local branch or tag name
 	cmd := exec.Command("git", "rev-parse", "--abbrev-ref", sha)
 	branchName, err := cmd.Output()
 	if err == nil {
@@ -415,6 +415,22 @@
 		}
 	}
 
+	// check sketch-host (outer) remote branches
+	cmd = exec.Command("git", "branch", "-r", "--contains", sha)
+	remoteBranches, err := cmd.Output()
+	if err == nil {
+		for line := range strings.Lines(string(remoteBranches)) {
+			line = strings.TrimSpace(line)
+			if line == "" {
+				continue
+			}
+			suf, ok := strings.CutPrefix(line, "sketch-host/")
+			if ok {
+				return suf
+			}
+		}
+	}
+
 	// short SHA
 	cmd = exec.Command("git", "rev-parse", "--short", sha)
 	shortSha, err := cmd.Output()