Add YouTrack pull/push sync with project settings and time tracking.

Wire manual Y menu and CLI sync for issues and work items, persist
per-project credentials, and keep local edits until an explicit push.

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

internal/ui/views/tickets.go

@@ -176,8 +176,12 @@ func (l *TicketList) renderCard(t ticket.Ticket, selected bool) string {
 	innerWidth := max(10, l.Width-4)
 
 	badge := l.statusBadge(t.Status)
-	headline := truncateOneLine(plainHeadline(t.Title), max(8, innerWidth-lipgloss.Width(badge)-2))
-	headerLine := badge + " " + l.Styles.Headline.Render(headline)
+	ext := ""
+	if t.ExternalID != "" {
+		ext = lipgloss.NewStyle().Faint(true).Render(t.ExternalID) + " "
+	}
+	headline := truncateOneLine(plainHeadline(t.Title), max(8, innerWidth-lipgloss.Width(badge)-lipgloss.Width(ext)-2))
+	headerLine := badge + " " + ext + l.Styles.Headline.Render(headline)
 
 	var content string
 	if selected {