fix: render initial UI on first load without REST or mesh connection

The rerender() call was only triggered by state changes. When
refreshState() returns early (standalone PWA) and no mesh connection
is made, the state never changes so the UI never renders. Call
rerender() once at boot to paint the initial state.

Author: Mearman

src/bridges/user/web/frontend/main.tsx

@@ -284,6 +284,7 @@ function rerender(): void {
 }
 
 state.subscribe(rerender);
+rerender();
 
 // ---------------------------------------------------------------------------
 // Boot