Stop controls that belong in every theme
The Stop button in Activity now uses Pekan’s theme-aware destructive colors instead of a fixed pale red border. That fixed border looked almost white against dark themes, making the compact control feel disconnected from the rest of the interface. Its border and text now come from the same semantic palette as other destructive actions, while its resting background stays aligned with the surrounding surface.
Hover and keyboard focus feedback use the matching destructive background, with a visible focus ring drawn from the destructive text color. Disabled controls retain the same semantic treatment and remain readable. The secondary Agent Runs panel now shares the exact same Stop component, so both places stay visually consistent while continuing to stop a run with one click.