Init projet Photostation - borne impression photo tactile PyQt6

Structure : 4 écrans (accueil, import, éditeur, impression),
navigation QStackedWidget, base éditeur QGraphicsScene.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/ui/main_window.py

@@ -0,0 +1,47 @@
+"""Fenêtre principale — navigation entre les écrans."""
+
+from PyQt6.QtWidgets import QMainWindow, QStackedWidget
+from PyQt6.QtCore import Qt
+from ui.screens.home_screen import HomeScreen
+from ui.screens.import_screen import ImportScreen
+from ui.screens.editor_screen import EditorScreen
+from ui.screens.print_screen import PrintScreen
+
+
+class MainWindow(QMainWindow):
+    def __init__(self):
+        super().__init__()
+        self.setWindowTitle("Photostation")
+        self.setAttribute(Qt.WidgetAttribute.WA_AcceptTouchEvents, True)
+
+        self.stack = QStackedWidget()
+        self.setCentralWidget(self.stack)
+
+        # Écrans
+        self.home_screen = HomeScreen(self)
+        self.import_screen = ImportScreen(self)
+        self.editor_screen = EditorScreen(self)
+        self.print_screen = PrintScreen(self)
+
+        self.stack.addWidget(self.home_screen)      # 0
+        self.stack.addWidget(self.import_screen)     # 1
+        self.stack.addWidget(self.editor_screen)     # 2
+        self.stack.addWidget(self.print_screen)      # 3
+
+        self.show_home()
+
+    def show_home(self):
+        self.stack.setCurrentIndex(0)
+
+    def show_import(self):
+        self.stack.setCurrentIndex(1)
+
+    def show_editor(self, image_path=None):
+        if image_path:
+            self.editor_screen.load_image(image_path)
+        self.stack.setCurrentIndex(2)
+
+    def show_print(self, image_path=None):
+        if image_path:
+            self.print_screen.set_image(image_path)
+        self.stack.setCurrentIndex(3)