f541f5e94e
- Topbar: hamburger button opens left drawer (was no onClick) - Topbar: project name navigates back to dashboard - Topbar: Versionen/Teilen/Hilfe/Benachrichtigungen get placeholder handlers - App.tsx: render right-tab-bar with 4 tab buttons (tool/layer/library/ki) - App.tsx: pass LeftSidebar as leftContent to MobileDrawers - App.tsx: pass RightSidebar as rightContent to MobileDrawers - MobileDrawers: accept leftContent/rightContent ReactNode props - MobileDrawers: render sidebar content in drawer bodies (was empty) - ui.types.ts: add onOpenLeftDrawer, onNavigateBack to TopbarProps - ui.types.ts: add leftContent, rightContent to MobileDrawersProps Test: 343/343 pass, tsc clean, build succeeds