Sync from development - prepare for v0.3.0

jackify/frontends/gui/widgets/feature_placeholder.py

@@ -0,0 +1,22 @@
+"""
+Placeholder widget for unimplemented feature screens.
+"""
+
+from PySide6.QtWidgets import QWidget, QLabel, QVBoxLayout, QPushButton
+from PySide6.QtCore import Qt
+
+
+class FeaturePlaceholder(QWidget):
+    """Placeholder widget for features not yet implemented."""
+
+    def __init__(self, stacked_widget=None):
+        super().__init__()
+        layout = QVBoxLayout()
+        label = QLabel("[Feature screen placeholder]")
+        label.setAlignment(Qt.AlignCenter)
+        layout.addWidget(label)
+        back_btn = QPushButton("Back to Main Menu")
+        if stacked_widget:
+            back_btn.clicked.connect(lambda: stacked_widget.setCurrentIndex(0))
+        layout.addWidget(back_btn)
+        self.setLayout(layout)