Open maximized and refine toolbar layout

app/qt/app.py

@@ -51,5 +51,5 @@ def run() -> int:
         defaults=DEFAULTS.copy(),
         reset_exclusions=RESET_EXCLUSIONS_ON_IMAGE_CHANGE,
     )
-    window.show()
+    window.showMaximized()
     return app.exec()

app/qt/main_window.py

@@ -68,9 +68,13 @@ class ToolbarButton(QtWidgets.QPushButton):
     """Rounded toolbar button inspired by the legacy design."""
 
     def __init__(self, icon_text: str, label: str, callback: Callable[[], None], parent: QtWidgets.QWidget | None = None):
-        super().__init__(f"{icon_text}  {label}", parent)
+        text = f"{icon_text}  {label}"
+        super().__init__(text, parent)
         self.setCursor(QtCore.Qt.PointingHandCursor)
-        self.setFixedHeight(34)
+        self.setFixedHeight(32)
+        metrics = QtGui.QFontMetrics(self.font())
+        width = metrics.horizontalAdvance(text) + 28
+        self.setMinimumWidth(width)
         self.setStyleSheet(
             """
             QPushButton {