feat/fix: "wallpaper" transparency handling

Introduce dynamic wallpaper transparency support for the image overlay. Adds QStackedWidget import and a new _set_wallpaper_transparency method that toggles WA_TranslucentBackground on the main window and key child widgets, updates stylesheets (with originals preserved/restored), and uses darkdetect to adapt combo popup background. Adds state fields (_wallpaper_active, _original_stylesheets), sets overlay opacity from state, and calls the transparency toggler when loading/hiding the overlay to avoid redundant updates.

src/interface/dialogs/image.py

@@ -1,7 +1,8 @@
-from PySide6.QtWidgets import QLabel, QGraphicsOpacityEffect
+from PySide6.QtWidgets import QLabel, QGraphicsOpacityEffect, QStackedWidget
 from PySide6.QtCore import Qt, QSize, QEvent, QObject
 from PySide6.QtGui import QImage, QPixmap
 from utils.data.state import state
+import darkdetect
 import os
 
 
@@ -16,6 +17,8 @@ class Image(QObject):
         self.overlay_label.setGraphicsEffect(self.opacity_effect)
 
         self._current_image_path = None
+        self._wallpaper_active = False
+        self._original_stylesheets = {}
         parent.installEventFilter(self)
         state.image_changed.connect(self.update_image_overlay)
 
@@ -28,9 +31,90 @@ class Image(QObject):
                 self._load_and_display(self._current_image_path)
         return False
 
+    def _set_wallpaper_transparency(self, enabled):
+        if self._wallpaper_active == enabled:
+            return
+        self._wallpaper_active = enabled
+        parent = self.application
+
+        central = parent.centralWidget()
+        if central:
+            central.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground, enabled)
+
+        for attr in ['tab_wrapper', 'corner_widget', 'titlebar']:
+            w = getattr(parent, attr, None)
+            if w:
+                w.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground, enabled)
+
+        if hasattr(parent, 'tabs'):
+            tabs = parent.tabs
+            tabs.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground, enabled)
+
+            for i in range(tabs.count()):
+                page = tabs.widget(i)
+                if page:
+                    page.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground, enabled)
+
+            stack = tabs.findChild(QStackedWidget)
+            if stack:
+                stack.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground, enabled)
+
+            tab_bar = tabs.tabBar()
+            if tab_bar:
+                tab_bar.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground, enabled)
+
+            if 'tabs' not in self._original_stylesheets:
+                self._original_stylesheets['tabs'] = tabs.styleSheet()
+            if enabled:
+                tabs.setStyleSheet(
+                    self._original_stylesheets['tabs']
+                    + "\nQTabWidget::pane { background: transparent; }"
+                    + "\nQTabBar { background: transparent; }"
+                    + "\nQTabBar::tab { background: transparent; }"
+                )
+            else:
+                tabs.setStyleSheet(self._original_stylesheets['tabs'])
+
+        # Searchbar
+        if hasattr(parent, 'searchbar'):
+            if 'searchbar' not in self._original_stylesheets:
+                self._original_stylesheets['searchbar'] = parent.searchbar.styleSheet()
+            if enabled:
+                parent.searchbar.setStyleSheet("QLineEdit { background-color: transparent; }")
+            else:
+                parent.searchbar.setStyleSheet(self._original_stylesheets['searchbar'])
+
+        # Download button
+        if hasattr(parent, 'dlbutton'):
+            if 'dlbutton' not in self._original_stylesheets:
+                self._original_stylesheets['dlbutton'] = parent.dlbutton.styleSheet()
+            if enabled:
+                parent.dlbutton.setStyleSheet("QPushButton { background-color: transparent; }")
+            else:
+                parent.dlbutton.setStyleSheet(self._original_stylesheets['dlbutton'])
+
+        # Labels
+        for attr in ['emptyResults', 'emptyDownload']:
+            w = getattr(parent, attr, None)
+            if w:
+                w.setAttribute(Qt.WidgetAttribute.WA_TranslucentBackground, enabled)
+
+        if hasattr(parent, 'tracker_list'):
+            if 'tracker_list' not in self._original_stylesheets:
+                self._original_stylesheets['tracker_list'] = parent.tracker_list.styleSheet()
+            if enabled:
+                popup_bg = '#1e1e1e' if darkdetect.isDark() else '#ffffff'
+                parent.tracker_list.setStyleSheet(
+                    "QComboBox { background-color: transparent; }"
+                    f" QComboBox QAbstractItemView {{ background-color: {popup_bg}; }}"
+                )
+            else:
+                parent.tracker_list.setStyleSheet(self._original_stylesheets['tracker_list'])
+
     def _load_and_display(self, image_path):
         if state.image_enabled is not True:
             self.overlay_label.hide()
+            self._set_wallpaper_transparency(False)
             return
         self._current_image_path = image_path
         parent = self.application
@@ -56,7 +140,11 @@ class Image(QObject):
             self.overlay_label.setGeometry(0, 0, parent.width(), parent.height())
             self.overlay_label.lower()
 
+            self.opacity_effect.setOpacity(state.image_opacity / 100)
+            self._set_wallpaper_transparency(True)
+
         else:
+            self._set_wallpaper_transparency(False)
             scaled_image = image.scaledToWidth(
                 state.image_width, Qt.TransformationMode.SmoothTransformation
             )