# Build log: Rechner

App in `rechner/`. Engine unit tests: 12 suites of cases (exact decimals, percent rules, powers, implicit multiplication, trig incl. exact angles, logs, factorial, errors, lenient input). Screenshots via Roborazzi → `replica/rechner/clone-screens/`.

| ID | date | status | missing | notes |
| --- | --- | --- | --- | --- |
| S01 Calculator | 2026-10-17 | done | – | verified on device: 12+34 live preview 46, = makes 46 the expression; display grows to meet the keypad |
| S02 Scientific | 2026-10-17 | done | – | verified on device: Rad, cos(π) → −1 |
| S03 History | 2026-10-17 | done | – | verified on device: pull down shows "Heute" group and the current expression |
| S04 Context menu | 2026-10-17 | done | cut | copy, paste, MS, MR |
| S05 Settings | 2026-10-17 | done | – | theme and clear history in the overflow menu |

Not done: landscape layout; scrolling through all digits of very long results.