feat: the changelog in the status pane, built in

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/update/update.go

@@ -50,9 +50,12 @@ type Release struct {
 // every release ends with.
 func (r Release) Notes() string {
 	notes, _, _ := strings.Cut(r.Body, "## Install")
-	return mdLink.ReplaceAllString(strings.TrimSpace(notes), "$1")
+	return PlainLinks(strings.TrimSpace(notes))
 }
 
+// PlainLinks shows Markdown links as their text, for a terminal.
+func PlainLinks(s string) string { return mdLink.ReplaceAllString(s, "$1") }
+
 // mdLink is a Markdown link, [text](url): the notes link PRs and commits,
 // and a terminal shows them as their text.
 var mdLink = regexp.MustCompile(`\[([^\]]+)\]\((https?://[^)\s]+)\)`)