feat(ui): enhance chat UI with new components and styling

refactor(chat): improve message display and actions
feat(chat): add high contrast mode toggle
style(chat): update spacing and sizing for better readability
feat(chat): add new Section and Stack layout components
docs: add UI style guide documentation
fix(chat): improve browser connection handling in scraper
feat(settings): expand default sources and improve UI
refactor: consolidate chat page layout and components

components/ui/button.tsx

@@ -21,12 +21,12 @@ const buttonVariants = cva(
         link: "text-primary underline-offset-4 hover:underline",
       },
       size: {
-        default: "h-9 px-4 py-2 has-[>svg]:px-3",
+        default: "h-10 px-4 py-2 has-[>svg]:px-3",
         sm: "h-8 rounded-md gap-1.5 px-3 has-[>svg]:px-2.5",
-        lg: "h-10 rounded-md px-6 has-[>svg]:px-4",
-        icon: "size-9",
+        lg: "h-12 rounded-md px-6 has-[>svg]:px-4",
+        icon: "size-10",
         "icon-sm": "size-8",
-        "icon-lg": "size-10",
+        "icon-lg": "size-12",
       },
     },
     defaultVariants: {