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/android/app/src/main/AndroidManifest.xml

@@ -10,6 +10,7 @@
             android:name=".MainActivity"
             android:configChanges="orientation|screenSize|screenLayout|keyboardHidden|uiMode|fontScale|smallestScreenSize"
             android:exported="true"
+            android:windowSoftInputMode="adjustResize"
             android:launchMode="singleTask"
         >
             <intent-filter>
@@ -37,4 +38,4 @@
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
-</manifest>
+</manifest>

crates/notedeck_chrome/android/app/src/main/java/com/damus/notedeck/MainActivity.java

@@ -26,12 +26,15 @@ public class MainActivity extends GameActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       // Shrink view so it does not get covered by insets.
+      super.onCreate(savedInstanceState);
 
       setupInsets();
+
       //setupFullscreen()
-      keyboardHelper = new KeyboardHeightHelper(this);
+
+      //keyboardHelper = new KeyboardHeightHelper(this);
       
-      super.onCreate(savedInstanceState);
+
   }
 
   private void setupFullscreen() {
@@ -61,6 +64,18 @@ public class MainActivity extends GameActivity {
   }
 
   private void setupInsets() {
+
+      // NOTE(jb55): This is needed for keyboard visibility. Without this the
+      // window still gets the right insets, but they’re consumed before they
+      // reach the NDK side.
+      //WindowCompat.setDecorFitsSystemWindows(getWindow(), false);
+
+      // NOTE(jb55): This is needed for keyboard visibility. If the bars are
+      // permanently gone, Android routes the keyboard over the GL surface and
+      // doesn’t change insets.
+      //WindowInsetsControllerCompat ic = WindowCompat.getInsetsController(getWindow(), getWindow().getDecorView());
+      //ic.setSystemBarsBehavior(WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE);
+
       View content = getContent();
       ViewCompat.setOnApplyWindowInsetsListener(content, (v, windowInsets) -> {
         Insets insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars());
@@ -72,12 +87,13 @@ public class MainActivity extends GameActivity {
         mlp.rightMargin = insets.right;
         v.setLayoutParams(mlp);
 
-        return WindowInsetsCompat.CONSUMED;
+        return windowInsets;
       });
 
-      WindowCompat.setDecorFitsSystemWindows(getWindow(), true);
+      WindowCompat.setDecorFitsSystemWindows(getWindow(), false);
   }
   
+  /*
   @Override
   public void onResume() {
       super.onResume();
@@ -95,6 +111,7 @@ public class MainActivity extends GameActivity {
       super.onDestroy();
       keyboardHelper.close();
   }
+  */
 
   @Override
   public boolean onTouchEvent(MotionEvent event) {