- Fix: SqliteAdapter.createLayer/updateLayer: convert JS booleans to integers (true→1, false→0)
- Root cause: better-sqlite3 cannot bind JS booleans, causing layer creation to fail
- Without layers, no elements could be created, making the entire CAD editor non-functional
- Fix: loadProjectDataTyped: remove Superseded throw for React StrictMode double-render safety
- Root cause: StrictMode double-render created two load requests, first was superseded and
set savedStatus to 'Fehler beim Laden', overwriting the successful second request
- Fix: App.tsx catch block: ignore cancelled/superseded errors to prevent false error status
- All tests pass: Backend 239/239, Frontend 374/374
- UI Test verified: Login → Dashboard → Project → CAD Editor → Line drawing → 4 elements created
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