css: route palette + body typography through hive-fr0nt::BASE_CSS

hive-ag3nt/src/web_ui.rs

@@ -162,10 +162,15 @@ async fn serve_index() -> impl IntoResponse {
 }
 
 async fn serve_css() -> impl IntoResponse {
-    (
-        [("content-type", "text/css")],
+    // Prepend the shared palette/typography so per-page styles only need
+    // to declare what's actually page-specific. One HTTP request, no
+    // per-asset cache to invalidate.
+    let body = format!(
+        "{}\n{}",
+        hive_fr0nt::BASE_CSS,
         include_str!("../assets/agent.css"),
-    )
+    );
+    ([("content-type", "text/css")], body)
 }
 
 async fn serve_app_js() -> impl IntoResponse {