1.2.1

1.2.1

Fixes label deletion not being findable.

What was wrong

Deleting a label worked — the action was correct at every level. What was missing was any sign that
it was available:

• Clicking a label did not update the toolbar's Label button, which is labelled with the
  selected label. So after adding a label, opening that menu without first clicking the label gave a
  single disabled row and no delete option anywhere on screen. It read as "deleting is broken" rather
  than "you skipped a step".
• A right-click deleted twice: two writes to the file, and two undos to walk back.
• Deletion had only one route, through the context-menu event.

What changed

• The Label button now shows the label you selected, so it is obvious it has something to act on.
• Right-click deletion fires once: one write, one undo step.
• Delete or Backspace now removes the selected label — no menu, no right-click.

To delete: click the label, then use Label → Delete label, press Delete, or right-click
it.

No format changes.