significant expansion of scss styling, incl. new _dashboard.scss sheet & comprehensive primary btn theme synced w. user palette; changes to all other scss files; list.html & base.html retrofitted w. corresponding scss classes

src/static_src/scss/core.scss

@@ -1,6 +1,7 @@
 @import 'rootvars';
 @import 'base';
 @import 'button-pad';
+@import 'dashboard';
 @import 'palette-picker';