chore: initial commit (Ausgangszustand der Vorlage)

.claude/skills/frontend/checklist.md

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+# Frontend Implementation Checklist
+
+Before marking frontend as complete:
+
+## shadcn/ui
+- [ ] Checked shadcn/ui for EVERY UI component needed
+- [ ] No custom duplicates of shadcn components created
+- [ ] Missing shadcn components installed via `npx shadcn@latest add`
+
+## Existing Code
+- [ ] Checked existing project components via `git ls-files src/components/`
+- [ ] Reused existing components where possible
+
+## Design
+- [ ] Design preferences clarified with user (if no mockups)
+- [ ] Component architecture from Solution Architect followed
+
+## Implementation
+- [ ] All planned components implemented
+- [ ] All components use Tailwind CSS (no inline styles, no CSS modules)
+- [ ] Loading states implemented (spinner/skeleton during data fetches)
+- [ ] Error states implemented (user-friendly error messages)
+- [ ] Empty states implemented ("No data yet" messages)
+
+## Quality
+- [ ] Responsive: Mobile (375px), Tablet (768px), Desktop (1440px)
+- [ ] Accessibility: Semantic HTML, ARIA labels, keyboard navigation
+- [ ] TypeScript: No errors (`npm run build` passes)
+- [ ] ESLint: No warnings (`npm run lint`)
+
+## Verification (run before marking complete)
+- [ ] `npm run build` passes without errors
+- [ ] All acceptance criteria from feature spec addressed in UI
+- [ ] `features/INDEX.md` status updated to "In Progress"
+
+## Completion
+- [ ] User has reviewed and approved the UI in browser
+- [ ] Code committed to git