feat: implement SVG icon handling and update button styles in settings dialog

src/core/interface/utils/svghelper.py

@@ -0,0 +1,30 @@
+
+
+from PySide6 import QtWidgets
+from PySide6.QtCore import Qt, QByteArray
+from PySide6.QtGui import QIcon, QPixmap, QPainter
+from PySide6.QtSvg import QSvgRenderer
+import darkdetect
+
+
+def _is_dark_mode():
+    return darkdetect.isDark()
+
+
+def svg_icon(svg_str, size=20):
+    app = QtWidgets.QApplication.instance()
+    if app:
+        if _is_dark_mode():
+            color = "white"
+        else:
+            color = "#555555"
+    else:
+        color = "white"
+    svg = svg_str.replace("{color}", color)
+    renderer = QSvgRenderer(QByteArray(svg.encode()))
+    pixmap = QPixmap(size, size)
+    pixmap.fill(Qt.GlobalColor.transparent)
+    painter = QPainter(pixmap)
+    renderer.render(painter)
+    painter.end()
+    return QIcon(pixmap)