Support Dark mode for the widget

Editor assessment

The subject states a significant capability, dark mode support for the widget, and feat is right, but a theming feature of this visibility ships with no body at all: no note on how the theme is selected, system preference versus configuration, or what surfaces were restyled. No scope, no footers beyond Co-authored-by. The trailing pull-request number is the conventional squash-merge marker. Hygiene is good: imperative shape, no trailing period, no junk. Clear and honest at the headline, thin as the record of a notable feature.