0.2.0

Goals can now count checkboxes, so the percentage nobody wants to maintain by hand gets counted instead.

## Cele

- Project X :: 80 / 85        ← still works
- [x] Ship the release        ← done or not
- [ ] Documentation           ← progress is the tally below
    - [x] readme
    - [ ] screenshots

For a goal with sub-tasks the panel shows 1 / 2 in place of a plan figure. A dropped sub-task (- [-]) leaves the count entirely — it is no longer part of the plan, and counting it as outstanding would keep a finished goal looking unfinished. An in-progress one (- [/]) counts as not done yet. The three forms mix in one section.

Also: bar widths moved out of JavaScript into CSS custom properties, the same fix the tooltip got in 0.1.1.