Add a built-in calculator to Excalidraw’s text tool. When typing a mathematical expression (like `1+2`) and entering an `=`, Excalidraw should automatically display the answer (e.g., `1+2=3`) directly in the text box.
## Feature Request: Built-in Calculator for Text Tool **Summary:** Please add a built-in calculator to Excalidraw’s text tool. When typing a mathematical expression (like `1+2`) and entering an `=`, Excalidraw should automatically display the answer (e.g., `1+2=3`) directly in the text box. **Key Features:** - **Inline Calculation:** Typing an expression such as `1+2=` should automatically evaluate and display `3` after the equals sign. - **Unit Support:** The calculator should recognize and compute expressions with units, e.g., `5m + 200cm = 7m`. It should handle both metric and imperial units. - **Conversion Options Popup:** When a unit is used (e.g., `5m=`), a popup should offer alternative representations, such as: - `5m = 500cm` - `5m = 50dm` - `5m ≈ 16.4ft` The user can select which format to insert. - **Settings Option:** Add a setting to choose the preferred measurement system (metric, imperial, or auto-detect), which controls default output fo