refactor: Remove most raw accesses into Application (#5104)

src/singletons/WindowManager.cpp

@@ -121,7 +121,7 @@ WindowManager::WindowManager(const Paths &paths)
     this->saveTimer->setSingleShot(true);
 
     QObject::connect(this->saveTimer, &QTimer::timeout, [] {
-        getApp()->windows->save();
+        getIApp()->getWindows()->save();
     });
 }
 
@@ -346,9 +346,10 @@ void WindowManager::initialize(Settings &settings, const Paths &paths)
     // We can safely ignore this signal connection since both Themes and WindowManager
     // share the Application state lifetime
     // NOTE: APPLICATION_LIFETIME
-    std::ignore = getApp()->themes->repaintVisibleChatWidgets_.connect([this] {
-        this->repaintVisibleChatWidgets();
-    });
+    std::ignore =
+        getIApp()->getThemes()->repaintVisibleChatWidgets_.connect([this] {
+            this->repaintVisibleChatWidgets();
+        });
 
     assert(!this->initialized_);