fix: mobile UI — hamburger onClick, right-tab-bar, drawer content, topbar buttons

- 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

frontend/test_report.md

@@ -0,0 +1,56 @@
+# Test Report — Mobile UI Fix
+
+**Task:** Fix Mobile UI — Sidebars, Drawers, Tab-Bar, Button Handlers
+**Date:** 2026-06-28
+
+## Changes Summary
+
+### Files Modified
+1. `src/types/ui.types.ts` — Added `onOpenLeftDrawer` and `onNavigateBack` to `TopbarProps`; added `leftContent` and `rightContent` to `MobileDrawersProps`
+2. `src/components/Topbar.tsx` — Added `onOpenLeftDrawer` and `onNavigateBack` to destructuring; wired `onClick` on hamburger button (→ `onOpenLeftDrawer`), project name button (→ `onNavigateBack`), Versionen/Teilen/Hilfe/Benachrichtigungen buttons (→ `console.log` placeholders)
+3. `src/components/MobileDrawers.tsx` — Added `leftContent`/`rightContent` to destructuring; rendered `{leftContent}` and `{rightContent}` in drawer bodies replacing empty comments
+4. `src/App.tsx` — Added `rightTabItems` constant array; passed `onOpenLeftDrawer` and `onNavigateBack` props to Topbar; rendered `<div className="right-tab-bar">` between StatusBar and MobileDrawers; passed `LeftSidebar` as `leftContent` and `RightSidebar` as `rightContent` to MobileDrawers
+
+## Test Results
+
+### TypeScript Check (`npx tsc --noEmit`)
+```
+EXIT_CODE=0
+```
+✅ Zero errors — clean type check
+
+### Unit Tests (`npx vitest run`)
+```
+Test Files  13 passed (13)
+     Tests  343 passed (343)
+  Duration  19.10s
+```
+✅ 343/343 tests passed — no regressions
+
+### Production Build (`npm run build`)
+```
+vite v5.4.21 building for production...
+✓ 337 modules transformed.
+dist/index.html                   0.37 kB │ gzip:   0.27 kB
+dist/assets/index-f2DS1W3w.css   46.87 kB │ gzip:   8.33 kB
+dist/assets/index-Ch0HMxp1.js   922.38 kB │ gzip: 316.96 kB
+✓ built in 6.98s
+```
+✅ Build succeeded
+
+## Bug Fixes Implemented
+
+| Bug | Description | Status |
+|-----|-------------|--------|
+| BUG 1 | Hamburger button has no onClick | ✅ Fixed — wired to `onOpenLeftDrawer` |
+| BUG 2 | Right vertical tab bar not rendered | ✅ Fixed — `right-tab-bar` div rendered with tab buttons |
+| BUG 3 | Drawer bodies are empty | ✅ Fixed — `leftContent`/`rightContent` rendered in drawer bodies |
+| BUG 4 | Topbar buttons without onClick | ✅ Fixed — all buttons have onClick handlers |
+
+## Smoke Test
+- App builds and starts without runtime errors
+- Hamburger button opens left drawer (onClick wired to `setMobileLeftOpen(true)`)
+- Right-tab-bar buttons open right drawer and set active tab (onClick wired to `setActiveDrawerTab` + `setMobileRightOpen(true)`)
+- Left drawer renders LeftSidebar content (tools)
+- Right drawer renders RightSidebar content (layer/library/ki panels)
+- Project name button navigates back to dashboard (onClick wired to `onNavigateBack`)