Add offline-first task-master TUI with tickets, board lists, and undo.

Charm-based CLI with JSON persistence, status/list filters, external editor editing, command-history undo/redo, and glamour markdown without AutoStyle OSC hangs.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/ui/views/markdown.go

@@ -0,0 +1,89 @@
+package views
+
+import (
+	"sync"
+
+	"github.com/charmbracelet/glamour"
+	"github.com/charmbracelet/glamour/styles"
+	"github.com/muesli/termenv"
+)
+
+type mdCacheKey struct {
+	width int
+	src   string
+}
+
+var (
+	mdMu       sync.Mutex
+	mdRenderer *glamour.TermRenderer
+	mdWidth    int
+	mdCache    = map[mdCacheKey]string{}
+)
+
+// RenderMarkdown renders Markdown to ANSI using a cached glamour renderer.
+//
+// Important: we intentionally use a fixed dark style — NOT WithAutoStyle().
+// AutoStyle calls termenv.HasDarkBackground(), which sends an OSC query to the
+// terminal and waits up to ~5s for a reply. In Cursor/some PTYs that reply
+// never arrives, so the TUI appears to hang on startup (first selected ticket
+// with a description triggers the renderer in ensureVisible/View).
+func RenderMarkdown(src string, width int) string {
+	if src == "" {
+		return ""
+	}
+	if width < 20 {
+		width = 20
+	}
+
+	key := mdCacheKey{width: width, src: src}
+	mdMu.Lock()
+	defer mdMu.Unlock()
+
+	if out, ok := mdCache[key]; ok {
+		return out
+	}
+
+	r, err := getRenderer(width)
+	if err != nil {
+		return src
+	}
+	out, err := r.Render(src)
+	if err != nil {
+		return src
+	}
+	for len(out) > 0 && (out[len(out)-1] == '\n' || out[len(out)-1] == ' ') {
+		out = out[:len(out)-1]
+	}
+	if len(mdCache) > 128 {
+		mdCache = map[mdCacheKey]string{}
+	}
+	mdCache[key] = out
+	return out
+}
+
+func getRenderer(width int) (*glamour.TermRenderer, error) {
+	if mdRenderer != nil && mdWidth == width {
+		return mdRenderer, nil
+	}
+	r, err := glamour.NewTermRenderer(
+		glamour.WithStyles(styles.DarkStyleConfig),
+		glamour.WithWordWrap(width),
+		glamour.WithColorProfile(termenv.ANSI256),
+		glamour.WithEmoji(),
+	)
+	if err != nil {
+		return nil, err
+	}
+	mdRenderer = r
+	mdWidth = width
+	return r, nil
+}
+
+// ClearMarkdownCache drops cached renders (e.g. after theme change).
+func ClearMarkdownCache() {
+	mdMu.Lock()
+	defer mdMu.Unlock()
+	mdCache = map[mdCacheKey]string{}
+	mdRenderer = nil
+	mdWidth = 0
+}