The custom-drawn green box + white tick was reading too utilitarian
against the row's other buttons (and the tick itself had defaulted
black against the dim green fill, hard to spot). Switches both
.task-select-box (per-row) and the master Select-all to the same
chrome the setup wizard uses for its app-pick cards:
- accent gradient fill on :checked (was status-success)
- 12px white SVG checkmark (inline data: URL, same one as
.setup-app input[type=checkbox]:checked::after)
- subtle inset border at rest, accent glow on hover/focus
- 0.22s setupCheckPop / taskCheckPop pop-in on tick
- indeterminate state on the master shows a horizontal dash,
drawn from a second inline SVG (still white on accent)
Sized to 18px so the row checkbox sits clean alongside the 22px-tall
.task-btn buttons. The master in the action bar reuses the same box
spec (no separate variant), matching the wizard's "one checkbox style,
many places" pattern.
Signed-off-by: librelad <librelad@digitalangels.vip>