Sub-task of #83 (gossamer migration). Reimplement the UI (`MainActivity` + `res/layout/activity_main.xml`) as the **AffineScript webview UI** hosted by the gossamer Android shell. **Depends on** the `NativeLib`→Rust port (the UI makes those JNI calls).
Sub-task of #83 (gossamer migration).
Reimplement the UI (
MainActivity+res/layout/activity_main.xml) as the AffineScript webview UI hosted by the gossamer Android shell.Depends on the
NativeLib→Rust port (the UI makes those JNI calls).