feat: the changelog in the status pane, built in

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

internal/ui/app/status.go

@@ -94,7 +94,7 @@ func (m Model) statusFields() []panes.Field {
 	add(panes.Field{Label: "docs", Value: repo + "/…/docs", URL: update.DefaultRepo + "/src/branch/main/docs"})
 	add(panes.Field{Label: "source", Value: repo, URL: update.DefaultRepo})
 	add(panes.Field{Label: "issues", Value: repo + "/issues", URL: update.DefaultRepo + "/issues"})
-	return out
+	return append(out, m.changelog...)
 }
 
 // updateStatus says whether a newer release is out, and when it was
@@ -141,3 +141,31 @@ func ago(d time.Duration) string {
 	}
 	return fmt.Sprintf("%dd ago", int(d.Hours()/24))
 }
+
+// changelogFields are CHANGELOG.md as rows: each release's version and
+// date, then its entries, marked by what kind they are.
+func changelogFields(md string) []panes.Field {
+	var out []panes.Field
+	kind := ""
+	for _, line := range strings.Split(md, "\n") {
+		line = strings.TrimSpace(line)
+		switch {
+		case strings.HasPrefix(line, "## "):
+			version, date, _ := strings.Cut(strings.TrimPrefix(line, "## "), " – ")
+			out = append(out, panes.Field{Label: version, Value: date, Info: true})
+			kind = ""
+		case strings.HasPrefix(line, "### "):
+			kind = strings.ToLower(strings.TrimPrefix(line, "### "))
+		case strings.HasPrefix(line, "- ") && len(out) > 0:
+			text := update.PlainLinks(strings.TrimPrefix(line, "- "))
+			if kind != "" {
+				text = kind + ": " + text
+			}
+			out = append(out, panes.Field{Value: text})
+		case line != "" && len(out) > 0 && !strings.HasPrefix(line, "<!--"):
+			// A release's own words ("Hello world 👋").
+			out = append(out, panes.Field{Value: update.PlainLinks(line)})
+		}
+	}
+	return out
+}