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_columns/src/app.rs

@@ -64,18 +64,15 @@ pub struct Damus {
     pub onboarding: Onboarding,
 }
 
-fn handle_key_events(input: &egui::InputState, columns: &mut Columns) {
+fn handle_egui_events(input: &egui::InputState, columns: &mut Columns) {
     for event in &input.raw.events {
-        #[allow(clippy::collapsible_match)]
-        if let egui::Event::Key {
-            key, pressed: true, ..
-        } = event
-        {
-            match key {
-                /*
+        match event {
+            egui::Event::Key { key, pressed, .. } if *pressed => match key {
                 egui::Key::J => {
-                    columns.select_down();
+                    //columns.select_down();
+                    {}
                 }
+                /*
                 egui::Key::K => {
                     columns.select_up();
                 }
@@ -90,7 +87,13 @@ fn handle_key_events(input: &egui::InputState, columns: &mut Columns) {
                     columns.get_selected_router().go_back();
                 }
                 _ => {}
+            },
+
+            egui::Event::InsetsChanged => {
+                tracing::debug!("insets have changed!");
             }
+
+            _ => {}
         }
     }
 }
@@ -102,7 +105,7 @@ fn try_process_event(
 ) -> Result<()> {
     let current_columns =
         get_active_columns_mut(app_ctx.i18n, app_ctx.accounts, &mut damus.decks_cache);
-    ctx.input(|i| handle_key_events(i, current_columns));
+    ctx.input(|i| handle_egui_events(i, current_columns));
 
     let ctx2 = ctx.clone();
     let wakeup = move || {