fix: show autosave failures

src/client/App.tsx

@@ -307,10 +307,6 @@ function PrivateApp() {
     [],
   );
 
-  const handleExcalidrawAPI = useCallback((api: ExcalidrawImperativeAPI) => {
-    excalidrawApiRef.current = api;
-  }, []);
-
   return (
     <div className="app-shell" ref={appShellRef}>
       {toastMessage && (
@@ -336,7 +332,9 @@ function PrivateApp() {
           onSceneChange={handleSceneChange}
           onSelectionStateChange={handleCodeBlockSelectionChange}
           onEditorActivity={scheduleThemeTokenSync}
-          onExcalidrawAPI={handleExcalidrawAPI}
+          onExcalidrawAPI={(api) => {
+            excalidrawApiRef.current = api;
+          }}
           renderEmbeddable={renderCodeBlockEmbeddable}
         />
         <CodeBlockSidebar

src/client/components/CodeBlockSidebar.tsx

@@ -30,24 +30,20 @@ function CodeBlockEditor({
 
   useEffect(() => {
     let cancelled = false;
-
-    const timeoutId = setTimeout(() => {
-      void renderHighlightedCodeBlockHtml(draft.code, draft.language)
-        .then((nextHtml) => {
-          if (!cancelled) {
-            setHtml(nextHtml);
-          }
-        })
-        .catch(() => {
-          if (!cancelled) {
-            setHtml(null);
-          }
-        });
-    }, 100);
+    void renderHighlightedCodeBlockHtml(draft.code, draft.language)
+      .then((nextHtml) => {
+        if (!cancelled) {
+          setHtml(nextHtml);
+        }
+      })
+      .catch(() => {
+        if (!cancelled) {
+          setHtml(null);
+        }
+      });
 
     return () => {
       cancelled = true;
-      clearTimeout(timeoutId);
     };
   }, [draft.code, draft.language]);
 

src/client/hooks/useDrawingSession.ts

@@ -231,6 +231,8 @@ export function useDrawingSession() {
           }
           if (isManual) {
             showToast("Saved", 2000);
+          } else {
+            showToast(null);
           }
         })
         .catch((saveError: unknown) => {
@@ -251,6 +253,8 @@ export function useDrawingSession() {
           );
           if (isManual) {
             showToast("Save failed", 2000);
+          } else {
+            showToast("Autosave failed");
           }
           throw saveError;
         })

src/server/http-server.tsx

@@ -12,6 +12,7 @@ export function createServer(options: CreateServerOptions = {}) {
   return {
     port: Number(process.env.PORT ?? "3000"),
     hostname: process.env.HOST ?? "localhost",
+    idleTimeout: 120,
     routes: {
       "/": (request: Request) => {
         const drawing = drawingStore.ensureInitialDrawing();