Implement soft keyboard visibility on Android

- Added `SoftKeyboardContext` enum and support for calculating keyboard
  insets from both virtual and platform sources

- Updated `AppContext` to provide `soft_keyboard_rect` for determining
  visible keyboard area

- Adjusted UI rendering to shift content when input boxes intersect with
  the soft keyboard, preventing overlap

- Modified `MainActivity` and Android manifest to use
  `windowSoftInputMode="adjustResize"` and updated window inset handling

- Introduced helper functions (`include_input`, `input_rect`,
  `clear_input_rect`) in `notedeck_ui` for tracking focused input boxes

- Fixed Android JNI keyboard height reporting to clamp negative values

Together, these changes allow the app to correctly detect and respond
to soft keyboard visibility on Android, ensuring input fields remain
accessible when typing.

Fixes: https://github.com/damus-io/notedeck/issues/946
Fixes: https://github.com/damus-io/notedeck/issues/1043

crates/notedeck_chrome/src/android.rs

@@ -17,7 +17,7 @@ pub async fn android_main(app: AndroidApp) {
     //std::env::set_var("DAVE_MODEL", "hhao/qwen2.5-coder-tools:latest");
     std::env::set_var(
         "RUST_LOG",
-        "egui=debug,egui-winit=debug,notedeck=debug,notedeck_columns=debug,notedeck_chrome=debug,enostr=debug,android_activity=debug",
+        "egui=debug,egui-winit=debug,winit=debug,notedeck=debug,notedeck_columns=debug,notedeck_chrome=debug,enostr=debug,android_activity=debug",
     );
 
     //std::env::set_var(
@@ -57,7 +57,7 @@ pub async fn android_main(app: AndroidApp) {
 
     options.android_app = Some(app.clone());
 
-    let app_args = get_app_args(app);
+    let app_args = get_app_args(app.clone());
 
     let _res = eframe::run_native(
         "Damus Notedeck",
@@ -65,6 +65,7 @@ pub async fn android_main(app: AndroidApp) {
         Box::new(move |cc| {
             let ctx = &cc.egui_ctx;
             let mut notedeck = Notedeck::new(ctx, path, &app_args);
+            notedeck.set_android_context(app.clone());
             notedeck.setup(ctx);
             let chrome = Chrome::new_with_apps(cc, &app_args, &mut notedeck)?;
             notedeck.set_app(chrome);