message: only apply theme tweaks to dark theme
diff: -body[btd-super-dark='true'],
  -body[btd-old-grey='true'] {
  +html.dark body[btd-super-dark='true'],
  +html.dark body[btd-old-grey='true'] {
  & .app-content .column-panel,
  & .app-content .column,
  & .app-navigator,
  @@ -54,7 +54,7 @@ body[btd-old-grey='true'] {
  }
  }
  -body[btd-super-dark='true'] {
  +html.dark body[btd-super-dark='true'] {
  --btd-theme-background: black;
  --btd-theme-background-lighter: #141414;
  --btd-theme-btn-hover: #2b2b2b;
  @@ -65,7 +65,7 @@ body[btd-super-dark='true'] {
  }
  }
  -body[btd-old-grey='true'] {
  +html.dark body[btd-old-grey='true'] {
  --btd-theme-background: hsl(210, 6%, 17%);
  --btd-theme-background-lighter: #373a3e;
  --btd-theme-btn-hover: #2b2b2b;
  