Changes

Sub-tasks:

Nestable tasks under parent to-dos with checkbox, editable title, expand/collapse to reveal their own targets and waypoints

Waypoint renaming:

Click a waypoint label to rename it inline Color-coded todos: per-todo color picker (9 presets) shown as a left-edge bar in the list and as the status dot in the HUD Waypoints merged into todo rows in the HUD — each todo shows its nearest coordinate distance inline instead of a separate section Sub-task targets are included in automatic inventory scanning