Add ticket time tracking with reports and entry management.

Support start/stop timer, manual durations, grouped reports, and per-ticket edit/delete of time entries with undo.

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

internal/ui/views/groupby.go

@@ -0,0 +1,79 @@
+package views
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+
+	"task/internal/ticket"
+)
+
+// GroupByMenu renders a report grouping picker.
+type GroupByMenu struct {
+	Cursor int
+	Width  int
+	Styles StatusMenuStyles
+}
+
+// NewGroupByMenu creates a menu with the given grouping pre-selected.
+func NewGroupByMenu(current ticket.GroupBy, width int, styles StatusMenuStyles) GroupByMenu {
+	return GroupByMenu{
+		Cursor: current.Index(),
+		Width:  width,
+		Styles: styles,
+	}
+}
+
+// MoveDown moves the selection down.
+func (m *GroupByMenu) MoveDown() {
+	if m.Cursor < len(ticket.AllGroupBys)-1 {
+		m.Cursor++
+	}
+}
+
+// MoveUp moves the selection up.
+func (m *GroupByMenu) MoveUp() {
+	if m.Cursor > 0 {
+		m.Cursor--
+	}
+}
+
+// JumpToShortcut moves the cursor to the option whose shortcut matches r.
+func (m *GroupByMenu) JumpToShortcut(r rune) bool {
+	r = unicode.ToLower(r)
+	for i, g := range ticket.AllGroupBys {
+		if g.Shortcut() == r {
+			m.Cursor = i
+			return true
+		}
+	}
+	return false
+}
+
+// Selected returns the currently highlighted grouping.
+func (m GroupByMenu) Selected() ticket.GroupBy {
+	if m.Cursor < 0 || m.Cursor >= len(ticket.AllGroupBys) {
+		return ticket.GroupByProject
+	}
+	return ticket.AllGroupBys[m.Cursor]
+}
+
+// View renders the grouping menu.
+func (m GroupByMenu) View() string {
+	var lines []string
+	lines = append(lines, m.Styles.Title.Render("Group report by"))
+	for i, g := range ticket.AllGroupBys {
+		entry := fmt.Sprintf("%c  %s", g.Shortcut(), g.Label())
+		if i == m.Cursor {
+			lines = append(lines, m.Styles.Selected.Render("▸ "+entry))
+		} else {
+			lines = append(lines, m.Styles.Normal.Render("  "+entry))
+		}
+	}
+	body := strings.Join(lines, "\n")
+	w := m.Width
+	if w < 20 {
+		w = 20
+	}
+	return m.Styles.Box.Width(min(40, w-2)).Render(body)
+}