fix: add safety checks for updateAppIcon IPC calls to prevent early startup race conditions

frontend/src/theme/ThemeContext.tsx

@@ -32,15 +32,24 @@ export const AppThemeProvider: React.FC<{ children: React.ReactNode }> = ({ chil
       await api.updateServerConfig({ theme });
     }
     if (api?.updateAppIcon) {
-      await api.updateAppIcon(theme);
+      try {
+        await api.updateAppIcon(theme);
+      } catch (e) { }
     }
   };
 
   useEffect(() => {
-    const api = (window as any).electronAPI;
-    if (api?.updateAppIcon && currentTheme) {
-      api.updateAppIcon(currentTheme);
-    }
+    const updateIcon = async () => {
+      const api = (window as any).electronAPI;
+      if (api?.updateAppIcon && currentTheme) {
+        try {
+          await api.updateAppIcon(currentTheme);
+        } catch (e) {
+          console.warn("[ThemeContext] updateAppIcon failed (likely not registered yet)");
+        }
+      }
+    };
+    updateIcon();
   }, [currentTheme]);
 
   const theme = useMemo(() => getTheme(currentTheme), [currentTheme]);