fix(edit): keep editor toolbar below the status bar after activity recreation

EditNoteActivity registered its window insets listener on the
DecorView. A listener set there replaces DecorView#onApplyWindowInsets
during insets dispatch, so the platform's own system bar fitting
silently depends on decor-internal state: after the activity is
recreated (for example when the system switches between light and dark
theme while a note is open), the new DecorView never applies the status
bar offset and the toolbar - including the in-note search bar - is
drawn behind the status bar.

Register the listener on the activity's content view instead and apply
the insets that actually arrive there. This leaves the platform's decor
handling intact: when the platform already fits the system bars, the
arriving insets are consumed and no extra padding is added; on a truly
edge-to-edge window the content view now pads itself, including the
display cutout. The bottom padding keeps the max(IME, system bar)
logic from the fix for #2700.

Reproduced on an Android 15 emulator by toggling dark mode while a
note was open (adb shell cmd uimode night yes).

Assisted-by: Claude Code:claude-fable-5
AI-assistant: Claude Code 2.1.195 (Claude Fable 5)
Signed-off-by: MiMoHo <37556964+MiMoHo@users.noreply.github.com>

Author: MiMoHo

app/src/main/java/it/niedermann/owncloud/notes/edit/EditNoteActivity.java

@@ -108,7 +108,7 @@ protected void onCreate(final Bundle savedInstanceState) {
 
         setSupportActionBar(binding.toolbar);
         binding.toolbar.setOnClickListener((v) -> fragment.showEditTitleDialog());
-        setImeInsets();
+        setWindowInsets();
 
         getOnBackPressedDispatcher().addCallback(this, new OnBackPressedCallback(true) {
             @Override
@@ -120,30 +120,30 @@ public void handleOnBackPressed() {
         });
     }
 
-    private void setImeInsets() {
+    private void setWindowInsets() {
         final var window = getWindow();
         if (window == null) {
             return;
         }
 
         WindowCompat.setDecorFitsSystemWindows(window, false);
 
-        final var decorView = window.getDecorView();
-        ViewCompat.setOnApplyWindowInsetsListener(decorView, (v, insets) -> {
+        ViewCompat.setOnApplyWindowInsetsListener(binding.getRoot(), (v, insets) -> {
+            Insets barInsets = insets.getInsets(
+                    WindowInsetsCompat.Type.systemBars() | WindowInsetsCompat.Type.displayCutout());
             Insets imeInsets = insets.getInsets(WindowInsetsCompat.Type.ime());
-            Insets navBarInsets = insets.getInsets(WindowInsetsCompat.Type.navigationBars());
 
             // Apply bottom padding when keyboard is shown
-            int bottomPadding = Math.max(imeInsets.bottom, navBarInsets.bottom);
+            int bottomPadding = Math.max(imeInsets.bottom, barInsets.bottom);
 
             v.setPadding(
-                    v.getPaddingLeft(),
-                    v.getPaddingTop(),
-                    v.getPaddingRight(),
+                    barInsets.left,
+                    barInsets.top,
+                    barInsets.right,
                     bottomPadding
             );
 
-            return insets;
+            return WindowInsetsCompat.CONSUMED;
         });
     }