Update tsdown & use @tsdown/css

This update simplifies the tsdown configuration, we do not need our custom plugin to minify CSS anymore (replaced by `css.minify = true`), and same for our hooks that rename the built CSS (replaced by `css.fileName`) 😍

assets/dist/components.js

@@ -1,2 +1,2 @@
 const components = {};
-export { components };
+export { components };

assets/dist/loader.js

@@ -9,4 +9,4 @@ function registerSvelteControllerComponents(svelteComponents = components) {
 		return component;
 	};
 }
-export { registerSvelteControllerComponents };
+export { registerSvelteControllerComponents };

assets/dist/register_controller.js

@@ -12,4 +12,4 @@ function registerSvelteControllerComponents(context) {
 		return component;
 	};
 }
-export { registerSvelteControllerComponents };
+export { registerSvelteControllerComponents };

assets/dist/render_controller.js

@@ -43,4 +43,4 @@ _Class.values = {
 	props: Object,
 	intro: Boolean
 };
-export { _Class as default };
+export { _Class as default };