Add AppSidebar built from the shadcn sidebar primitives (collapsible icon
rail, editable title, nav with active states, footer theme toggle and
connection status) and wrap the app in a sidebar provider with an inset
top bar. Preserves the always-mounted Playground pattern.
- add src/components/AppSidebar.svelte
- restructure App.svelte around Sidebar.Provider/Inset
- remove Header.svelte
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UmuGqwNBJNEAMaWsdCDqUC
Claude