Add interactive Markdown checklist toggles in the ticket preview.

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

internal/ui/keys.go

@@ -17,16 +17,18 @@ type KeyMap struct {
 	Delete       key.Binding // x — confirm first
 	DeleteForce  key.Binding // X — immediate
 	ConfirmYes   key.Binding
-	Toggle       key.Binding // space — toggle multi-select
-	Timer        key.Binding // t — start/stop timer
-	TimeManual   key.Binding // T — manual duration
-	TimeEntries  key.Binding // m — manage time entries
-	Report       key.Binding // r — time report
-	Undo         key.Binding
-	Redo         key.Binding
-	Quit         key.Binding
-	Enter        key.Binding
-	Escape       key.Binding
+	Toggle        key.Binding // space — toggle multi-select / checklist item
+	ChecklistPrev key.Binding // K / shift+up — previous checkbox
+	ChecklistNext key.Binding // J / shift+down — next checkbox
+	Timer         key.Binding // t — start/stop timer
+	TimeManual    key.Binding // T — manual duration
+	TimeEntries   key.Binding // m — manage time entries
+	Report        key.Binding // r — time report
+	Undo          key.Binding
+	Redo          key.Binding
+	Quit          key.Binding
+	Enter         key.Binding
+	Escape        key.Binding
 }
 
 // DefaultKeyMap returns the default key bindings.
@@ -88,6 +90,14 @@ func DefaultKeyMap() KeyMap {
 			key.WithKeys(" "),
 			key.WithHelp("space", "toggle"),
 		),
+		ChecklistPrev: key.NewBinding(
+			key.WithKeys("K", "shift+up"),
+			key.WithHelp("J/K", "checklist"),
+		),
+		ChecklistNext: key.NewBinding(
+			key.WithKeys("J", "shift+down"),
+			key.WithHelp("J/K", "checklist"),
+		),
 		Timer: key.NewBinding(
 			key.WithKeys("t"),
 			key.WithHelp("t", "timer"),