Sidebar flashes empty on initial load

[fernandomenuk]

Severity: Major

Description

The sidebar is visible by default on load (no .hidden class in HTML, and sidebarVisible = true in JS), but it has no content until refreshTabs() completes asynchronously. This causes a brief flash of an empty sidebar panel before workspace items populate.

Location

• crates/wmux-app/frontend/sidebar.js:4 (sidebarVisible = true)
• crates/wmux-app/frontend/index.html:20-23 (sidebar HTML, no hidden class)

Suggestion

Either start the sidebar hidden until the first refreshTabs() completes, or render a loading/skeleton state.