first ui widget placement

ui/widgets/placeholder_widget.py

@@ -0,0 +1,35 @@
+from PySide6.QtWidgets import QWidget, QLabel, QVBoxLayout
+from PySide6.QtGui import QPalette, QColor
+from PySide6.QtCore import Qt
+
+class PlaceholderWidget(QWidget):
+    """A custom widget to display a colored background with centered text."""
+    def __init__(self, text: str, color: str, parent=None):
+        super().__init__(parent)
+        self.setAutoFillBackground(True)
+        self.set_color(color)
+
+        self.label = QLabel(text)
+        self.label.setAlignment(Qt.AlignmentFlag.AlignCenter)
+        
+        font = self.label.font()
+        font.setPointSize(24)
+        self.label.setFont(font)
+        self.label.setWordWrap(True)
+
+        layout = QVBoxLayout(self)
+        layout.addWidget(self.label)
+        self.setLayout(layout)
+
+    def set_text(self, text: str):
+        self.label.setText(text)
+
+    def set_color(self, color: str):
+        palette = self.palette()
+        palette.setColor(QPalette.ColorRole.Window, QColor(color))
+        self.setPalette(palette)
+
+    def set_text_color(self, color: str):
+        palette = self.label.palette()
+        palette.setColor(QPalette.ColorRole.WindowText, QColor(color))
+        self.label.setPalette(palette)