web: serve UI as text/html (Html wrapper, not raw &str)

src/web/mod.rs

@@ -19,7 +19,7 @@ use axum::{
     http::{HeaderMap, Request, StatusCode},
     middleware::{self, Next},
     response::{
-        Response,
+        Html, Response,
         sse::{Event as SseEvent, Sse},
     },
     routing::get,
@@ -120,7 +120,7 @@ pub fn router(app: AppState) -> Router {
         .route("/events", get(events_stream))
         .layer(middleware::from_fn_with_state(app.clone(), token_guard));
     Router::new()
-        .route("/", get(|| async { UI_HTML }))
+        .route("/", get(|| async { Html(UI_HTML) }))
         .merge(protected)
         .with_state(app)
 }