trigger theme switch with user theme on app start

ts/components/ConversationListItem.tsx

@@ -72,8 +72,11 @@ type PropsHousekeeping = {
 type Props = PropsData & PropsHousekeeping;
 
 const Portal = ({ children }: { children: any }) => {
-  return createPortal(children, document.querySelector('.inbox.index') as Element);
-}
+  return createPortal(
+    children,
+    document.querySelector('.inbox.index') as Element
+  );
+};
 
 class ConversationListItem extends React.PureComponent<Props> {
   public constructor(props: Props) {

ts/components/session/ActionsPanel.tsx

@@ -37,6 +37,15 @@ class ActionsPanelPrivate extends React.Component<Props> {
     void removeItemById('hasSeenLightModeDialog');
   }
 
+  // fetch the user saved theme from the db, and apply it on mount.
+  public componentDidMount() {
+    const theme = window.Events.getThemeSetting();
+    window.setTheme(theme);
+
+    const newThemeObject = theme === 'dark' ? darkTheme : lightTheme;
+    this.props.applyTheme(newThemeObject);
+  }
+
   public Section = ({
     isSelected,
     onSelect,